sin x
This calls Python's built-in math.sin function, which computes the sine of x.
math.sin
i1 : sin toPython 0 o1 = 0.0 o1 : PythonObject of class float
i2 : sin toPython (pi / 2) o2 = 1.0 o2 : PythonObject of class float
The source of this document is in Python/doc/trig.m2:157:0.