math.expm1(x) Return e**x - 1. For small floats x, the subtraction in exp(x) - 1 can result

math.asin(x) Return the arc sine of x, in radians.

math.cosh(x) Return the hyperbolic cosine of x.

to_sci_string(x) Converts a number to a string using scientific notation.

cmath.phase(x) Return the phase of x (also known as the argument of x), as a float. phase(x)

is_snan() Return

statistics.pstdev(data, mu=None) Return the population standard deviation (the square root of the population variance). See

shift(x, y) Returns a shifted copy of x, y times.

class decimal.DefaultContext This context is used by the Context constructor as a prototype for new contexts. Changing

class decimal.ExtendedContext This is a standard context defined by the General Decimal Arithmetic Specification. Precision