>>> import math

# math.floor(x) returns the floor of x as a float, the largest integer value less than or equal to x.
>>> math.floor(9.2)

9.0

# math.sqrt(x) returns the square root of x.

>>> math.sqrt(81)

9.0

# math.pow(x,y) returns x raised to the power y.

>>> math.pow(2,3)

8.0

# math.log10(x) returns the base-10 logarithm of x.

>>> math.log10(100)
2.0

# math.exp(x) returns e**x.

>>> math.exp(2)

7.38905609893065

# check if the float x is a NaN

>>> math.isnan(x)

# equivalent to the output of float('nan').
>>> math.nan  # python3

nan

>>> math.pi
3.141592653589793

>>> math.e
2.718281828459045