import math

def f(x):
    return (5/2) * x**4 + x**2 / 6 + 7

def g(x):
    return (3 * x - 2) / 2 + (x - 7)**3 / 7 + 2

def h(x, y):
    x = math.radians(x)
    return (y * math.sin(x)) / (y**2 - 4)

def k(x):
    return math.sqrt(f(x)) - g(x**2)