# Imports
from math import pi
pi * 71 / 223
from math import sin
sin(pi/2)

# Function values
max
max(3, 4)
f = max
f
f(3, 4)
max = 7
f(3, 4)
f(3, max)
f = 2
# f(3, 4)


# User-defined functions
from operator import add, mul
add(2, 3)
mul(2, 3)

def square(x):
    return mul(x, x)

square(21)

