def f(x):
return x**2-x
def integrate_f(a, b, N):
s = 0.0
dx = (b-a)/N
for i in range(N):
s += f(a+i*dx)
return s * dx
def f(x):
return x**2-x
def integrate_f(a, b, N):
s = 0.0
dx = (b-a)/N
for i in range(N):
s += f(a+i*dx)
return s * dx
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