Python sin(x) function returns the sine value of radian angle x. The principle values for x is [-∞,∞]. It's a method of math module.

>>> import math
>>> math.sin(math.pi)

1.2246467991473532e-16

>>> math.sin(math.pi/2)

1.0

>>> math.sin(math.pi/6)

0.49999999999999994

>>> math.sin(math.pi/3)

0.8660254037844386