def say_hello_to(name):
  print("Hello %s!" % name)

from math import sin

def f(double x):
    return sin(x**2)

def integrate_f(double a, double b, int N):
    cdef int i
    cdef double s, dx
    s = 0
    dx = (b-a)/N
    for i in range(N):
        s += f(a+i*dx)
    return s * dx