import numpy as np

def inverse(x):
    return 1/x

def inverse2(x):
    return 1/(x**2)

def inverse0_5(x):
    return 1/(x**0.5)

def sinOverx(x):
    return np.sin(x)/x

def cosOverx(x):
    return np.cos(x)/x

def cosSquared(x):
    return np.cos(x**2)