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<div class="section-link"><a href="introduction.html#introduction">1. Introduction</a></div>
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<div class="section-link"><a href="introduction.html#what-is-libdevice">1.1. What Is libdevice?</a></div>
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<li>
<div class="section-link"><a href="basic-usage.html#basic-usage">2. Basic Usage</a></div>
<ul>
<li>
<div class="section-link"><a href="basic-usage.html#linking-with-libdevice">2.1. Linking with libdevice</a></div>
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<div class="section-link"><a href="basic-usage.html#version-selection">2.2. Selecting Library Version</a></div>
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<div class="section-link"><a href="function-desc.html#function-desc">3. Function Reference</a></div>
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<li>
<div class="section-link"><a href="__nv_abs.html#__nv_abs">3.1. __nv_abs</a></div>
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<div class="section-link"><a href="__nv_acos.html#__nv_acos">3.2. __nv_acos</a></div>
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<div class="section-link"><a href="__nv_acosf.html#__nv_acosf">3.3. __nv_acosf</a></div>
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<div class="section-link"><a href="__nv_acosh.html#__nv_acosh">3.4. __nv_acosh</a></div>
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<div class="section-link"><a href="__nv_acoshf.html#__nv_acoshf">3.5. __nv_acoshf</a></div>
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<div class="section-link"><a href="__nv_asin.html#__nv_asin">3.6. __nv_asin</a></div>
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<div class="section-link"><a href="__nv_asinf.html#__nv_asinf">3.7. __nv_asinf</a></div>
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<div class="section-link"><a href="__nv_asinh.html#__nv_asinh">3.8. __nv_asinh</a></div>
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<div class="section-link"><a href="__nv_asinhf.html#__nv_asinhf">3.9. __nv_asinhf</a></div>
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<div class="section-link"><a href="__nv_atan.html#__nv_atan">3.10. __nv_atan</a></div>
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<div class="section-link"><a href="__nv_atan2.html#__nv_atan2">3.11. __nv_atan2</a></div>
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<div class="section-link"><a href="__nv_atan2f.html#__nv_atan2f">3.12. __nv_atan2f</a></div>
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<div class="section-link"><a href="__nv_atanf.html#__nv_atanf">3.13. __nv_atanf</a></div>
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<div class="section-link"><a href="__nv_atanh.html#__nv_atanh">3.14. __nv_atanh</a></div>
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<div class="section-link"><a href="__nv_atanhf.html#__nv_atanhf">3.15. __nv_atanhf</a></div>
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<div class="section-link"><a href="__nv_brev.html#__nv_brev">3.16. __nv_brev</a></div>
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<div class="section-link"><a href="__nv_brevll.html#__nv_brevll">3.17. __nv_brevll</a></div>
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<div class="section-link"><a href="__nv_byte_perm.html#__nv_byte_perm">3.18. __nv_byte_perm</a></div>
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<div class="section-link"><a href="__nv_cbrt.html#__nv_cbrt">3.19. __nv_cbrt</a></div>
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<div class="section-link"><a href="__nv_cbrtf.html#__nv_cbrtf">3.20. __nv_cbrtf</a></div>
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<div class="section-link"><a href="__nv_ceil.html#__nv_ceil">3.21. __nv_ceil</a></div>
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<div class="section-link"><a href="__nv_ceilf.html#__nv_ceilf">3.22. __nv_ceilf</a></div>
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<div class="section-link"><a href="__nv_clz.html#__nv_clz">3.23. __nv_clz</a></div>
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<div class="section-link"><a href="__nv_clzll.html#__nv_clzll">3.24. __nv_clzll</a></div>
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<div class="section-link"><a href="__nv_copysign.html#__nv_copysign">3.25. __nv_copysign</a></div>
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<div class="section-link"><a href="__nv_copysignf.html#__nv_copysignf">3.26. __nv_copysignf</a></div>
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<div class="section-link"><a href="__nv_cos.html#__nv_cos">3.27. __nv_cos</a></div>
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<div class="section-link"><a href="__nv_cosf.html#__nv_cosf">3.28. __nv_cosf</a></div>
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<div class="section-link"><a href="__nv_cosh.html#__nv_cosh">3.29. __nv_cosh</a></div>
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<div class="section-link"><a href="__nv_dadd_rd.html#__nv_dadd_rd">3.33. __nv_dadd_rd</a></div>
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<div class="section-link"><a href="__nv_dadd_rn.html#__nv_dadd_rn">3.34. __nv_dadd_rn</a></div>
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<div class="section-link"><a href="__nv_dadd_ru.html#__nv_dadd_ru">3.35. __nv_dadd_ru</a></div>
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<div class="section-link"><a href="__nv_dadd_rz.html#__nv_dadd_rz">3.36. __nv_dadd_rz</a></div>
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<div class="section-link"><a href="__nv_ddiv_rd.html#__nv_ddiv_rd">3.37. __nv_ddiv_rd</a></div>
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<div class="section-link"><a href="__nv_ddiv_rn.html#__nv_ddiv_rn">3.38. __nv_ddiv_rn</a></div>
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<div class="section-link"><a href="__nv_ddiv_ru.html#__nv_ddiv_ru">3.39. __nv_ddiv_ru</a></div>
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<div class="section-link"><a href="__nv_ddiv_rz.html#__nv_ddiv_rz">3.40. __nv_ddiv_rz</a></div>
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<div class="section-link"><a href="__nv_dmul_rd.html#__nv_dmul_rd">3.41. __nv_dmul_rd</a></div>
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<div class="section-link"><a href="__nv_dmul_rn.html#__nv_dmul_rn">3.42. __nv_dmul_rn</a></div>
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<div class="section-link"><a href="__nv_dmul_ru.html#__nv_dmul_ru">3.43. __nv_dmul_ru</a></div>
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<div class="section-link"><a href="__nv_dmul_rz.html#__nv_dmul_rz">3.44. __nv_dmul_rz</a></div>
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<div class="section-link"><a href="__nv_double2float_rd.html#__nv_double2float_rd">3.45. __nv_double2float_rd</a></div>
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<div class="section-link"><a href="__nv_double2float_rn.html#__nv_double2float_rn">3.46. __nv_double2float_rn</a></div>
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<div class="section-link"><a href="__nv_double2float_rz.html#__nv_double2float_rz">3.48. __nv_double2float_rz</a></div>
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<div class="section-link"><a href="__nv_double2hiint.html#__nv_double2hiint">3.49. __nv_double2hiint</a></div>
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<div class="section-link"><a href="__nv_double2int_rd.html#__nv_double2int_rd">3.50. __nv_double2int_rd</a></div>
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<div class="section-link"><a href="__nv_double2ll_rd.html#__nv_double2ll_rd">3.54. __nv_double2ll_rd</a></div>
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<div class="section-link"><a href="__nv_double2ll_rn.html#__nv_double2ll_rn">3.55. __nv_double2ll_rn</a></div>
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<div class="section-link"><a href="__nv_double2ll_ru.html#__nv_double2ll_ru">3.56. __nv_double2ll_ru</a></div>
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<div class="section-link"><a href="__nv_double2ll_rz.html#__nv_double2ll_rz">3.57. __nv_double2ll_rz</a></div>
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<div class="section-link"><a href="__nv_double2loint.html#__nv_double2loint">3.58. __nv_double2loint</a></div>
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<div class="section-link"><a href="__nv_double2uint_rd.html#__nv_double2uint_rd">3.59. __nv_double2uint_rd</a></div>
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<div class="section-link"><a href="__nv_double2uint_rn.html#__nv_double2uint_rn">3.60. __nv_double2uint_rn</a></div>
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<div class="section-link"><a href="__nv_double2uint_ru.html#__nv_double2uint_ru">3.61. __nv_double2uint_ru</a></div>
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<div class="section-link"><a href="__nv_double2uint_rz.html#__nv_double2uint_rz">3.62. __nv_double2uint_rz</a></div>
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<div class="section-link"><a href="__nv_double2ull_rd.html#__nv_double2ull_rd">3.63. __nv_double2ull_rd</a></div>
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<div class="section-link"><a href="__nv_double2ull_rn.html#__nv_double2ull_rn">3.64. __nv_double2ull_rn</a></div>
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<div class="section-link"><a href="__nv_double2ull_ru.html#__nv_double2ull_ru">3.65. __nv_double2ull_ru</a></div>
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<div class="section-link"><a href="__nv_double2ull_rz.html#__nv_double2ull_rz">3.66. __nv_double2ull_rz</a></div>
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<div class="section-link"><a href="__nv_double_as_longlong.html#__nv_double_as_longlong">3.67. __nv_double_as_longlong</a></div>
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<div class="section-link"><a href="__nv_drcp_rd.html#__nv_drcp_rd">3.68. __nv_drcp_rd</a></div>
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<div class="section-link"><a href="__nv_drcp_rn.html#__nv_drcp_rn">3.69. __nv_drcp_rn</a></div>
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<div class="section-link"><a href="__nv_drcp_ru.html#__nv_drcp_ru">3.70. __nv_drcp_ru</a></div>
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<div class="section-link"><a href="__nv_drcp_rz.html#__nv_drcp_rz">3.71. __nv_drcp_rz</a></div>
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<div class="section-link"><a href="__nv_dsqrt_rd.html#__nv_dsqrt_rd">3.72. __nv_dsqrt_rd</a></div>
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<div class="section-link"><a href="__nv_dsqrt_rn.html#__nv_dsqrt_rn">3.73. __nv_dsqrt_rn</a></div>
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<div class="section-link"><a href="__nv_dsqrt_ru.html#__nv_dsqrt_ru">3.74. __nv_dsqrt_ru</a></div>
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<div class="section-link"><a href="__nv_dsqrt_rz.html#__nv_dsqrt_rz">3.75. __nv_dsqrt_rz</a></div>
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<div class="section-link"><a href="__nv_erf.html#__nv_erf">3.76. __nv_erf</a></div>
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<div class="section-link"><a href="__nv_erfc.html#__nv_erfc">3.77. __nv_erfc</a></div>
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<div class="section-link"><a href="__nv_erfcf.html#__nv_erfcf">3.78. __nv_erfcf</a></div>
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<div class="section-link"><a href="__nv_erfcinv.html#__nv_erfcinv">3.79. __nv_erfcinv</a></div>
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<div class="section-link"><a href="__nv_erfcinvf.html#__nv_erfcinvf">3.80. __nv_erfcinvf</a></div>
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<div class="section-link"><a href="__nv_erfcx.html#__nv_erfcx">3.81. __nv_erfcx</a></div>
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<div class="section-link"><a href="__nv_erfcxf.html#__nv_erfcxf">3.82. __nv_erfcxf</a></div>
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<div class="section-link"><a href="__nv_erff.html#__nv_erff">3.83. __nv_erff</a></div>
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<div class="section-link"><a href="__nv_erfinv.html#__nv_erfinv">3.84. __nv_erfinv</a></div>
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<div class="section-link"><a href="__nv_erfinvf.html#__nv_erfinvf">3.85. __nv_erfinvf</a></div>
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<div class="section-link"><a href="__nv_exp.html#__nv_exp">3.86. __nv_exp</a></div>
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<div class="section-link"><a href="__nv_exp10.html#__nv_exp10">3.87. __nv_exp10</a></div>
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<div class="section-link"><a href="__nv_exp10f.html#__nv_exp10f">3.88. __nv_exp10f</a></div>
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<div class="section-link"><a href="__nv_exp2.html#__nv_exp2">3.89. __nv_exp2</a></div>
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<div class="section-link"><a href="__nv_exp2f.html#__nv_exp2f">3.90. __nv_exp2f</a></div>
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<div class="section-link"><a href="__nv_expf.html#__nv_expf">3.91. __nv_expf</a></div>
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<div class="section-link"><a href="__nv_expm1.html#__nv_expm1">3.92. __nv_expm1</a></div>
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<div class="section-link"><a href="__nv_expm1f.html#__nv_expm1f">3.93. __nv_expm1f</a></div>
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<div class="section-link"><a href="__nv_fabs.html#__nv_fabs">3.94. __nv_fabs</a></div>
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<div class="section-link"><a href="__nv_fabsf.html#__nv_fabsf">3.95. __nv_fabsf</a></div>
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<div class="section-link"><a href="__nv_fadd_rd.html#__nv_fadd_rd">3.96. __nv_fadd_rd</a></div>
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<div class="section-link"><a href="__nv_fadd_rn.html#__nv_fadd_rn">3.97. __nv_fadd_rn</a></div>
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<div class="section-link"><a href="__nv_fadd_ru.html#__nv_fadd_ru">3.98. __nv_fadd_ru</a></div>
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<div class="section-link"><a href="__nv_fadd_rz.html#__nv_fadd_rz">3.99. __nv_fadd_rz</a></div>
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<div class="section-link"><a href="__nv_fast_cosf.html#__nv_fast_cosf">3.100. __nv_fast_cosf</a></div>
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<div class="section-link"><a href="__nv_fast_exp10f.html#__nv_fast_exp10f">3.101. __nv_fast_exp10f</a></div>
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<div class="section-link"><a href="__nv_fast_expf.html#__nv_fast_expf">3.102. __nv_fast_expf</a></div>
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<div class="section-link"><a href="__nv_fast_fdividef.html#__nv_fast_fdividef">3.103. __nv_fast_fdividef</a></div>
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<div class="section-link"><a href="__nv_fast_log10f.html#__nv_fast_log10f">3.104. __nv_fast_log10f</a></div>
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<div class="section-link"><a href="__nv_fast_log2f.html#__nv_fast_log2f">3.105. __nv_fast_log2f</a></div>
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<div class="section-link"><a href="__nv_fast_logf.html#__nv_fast_logf">3.106. __nv_fast_logf</a></div>
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<div class="section-link"><a href="__nv_fast_powf.html#__nv_fast_powf">3.107. __nv_fast_powf</a></div>
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<div class="section-link"><a href="__nv_fast_sincosf.html#__nv_fast_sincosf">3.108. __nv_fast_sincosf</a></div>
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<div class="section-link"><a href="__nv_fast_sinf.html#__nv_fast_sinf">3.109. __nv_fast_sinf</a></div>
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<div class="section-link"><a href="__nv_fast_tanf.html#__nv_fast_tanf">3.110. __nv_fast_tanf</a></div>
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<div class="section-link"><a href="__nv_fdim.html#__nv_fdim">3.111. __nv_fdim</a></div>
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<div class="section-link"><a href="__nv_fdimf.html#__nv_fdimf">3.112. __nv_fdimf</a></div>
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<div class="section-link"><a href="__nv_fdiv_rd.html#__nv_fdiv_rd">3.113. __nv_fdiv_rd</a></div>
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<div class="section-link"><a href="__nv_fdiv_rn.html#__nv_fdiv_rn">3.114. __nv_fdiv_rn</a></div>
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<div class="section-link"><a href="__nv_fdiv_ru.html#__nv_fdiv_ru">3.115. __nv_fdiv_ru</a></div>
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<div class="section-link"><a href="__nv_fdiv_rz.html#__nv_fdiv_rz">3.116. __nv_fdiv_rz</a></div>
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<div class="section-link"><a href="__nv_float2half_rn.html#__nv_float2half_rn">3.120. __nv_float2half_rn</a></div>
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<div class="section-link"><a href="__nv_float2int_rd.html#__nv_float2int_rd">3.121. __nv_float2int_rd</a></div>
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<div class="section-link"><a href="__nv_float2int_rn.html#__nv_float2int_rn">3.122. __nv_float2int_rn</a></div>
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<div class="section-link"><a href="__nv_float2int_ru.html#__nv_float2int_ru">3.123. __nv_float2int_ru</a></div>
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<div class="topic nested1" id="__nv_atan"><a name="__nv_atan" shape="rect">
<!-- --></a><h2 class="topictitle2">3.10. __nv_atan</h2>
<div class="body conbody">
<p class="p"><strong class="ph b">Prototype</strong>:
</p><pre xml:space="preserve">
double @__nv_atan(double %x)
</pre><p class="p"><strong class="ph b">Description</strong>:
</p>
<p class="p">Calculate the principal value of the arc tangent of the input argument <tt class="ph tt">x</tt>.
</p>
<p class="p"></p>
<p class="p"><strong class="ph b">Returns:</strong></p>
<div class="p">Result will be in radians, in the interval [-
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi>π</mi>
</math>
/2, +
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi>π</mi>
</math>
/2].
<ul class="ul">
<li class="li">
<p class="p">__nv_atan(0) returns +0.</p>
</li>
</ul>
</div>
<div class="p">
<div class="note note"><span class="notetitle">Note:</span><p class="p">For accuracy information for this function see the CUDA C Programming Guide, Appendix D.1, Table 7. </p>
</div>
</div>
<p class="p"><strong class="ph b">Library Availability</strong>:
</p>
<p class="p">Compute 2.0: Yes</p>
<p class="p">Compute 3.0: Yes</p>
<p class="p">Compute 3.5: Yes</p>
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