ang - Angle between two vectors.
eu - Approximate differential equation using Euler's Method.
expec - Expected value of a distribution.
inv - Find an inverse function.
mode - Mode of a list.
ns - Guess non-negative integer solutions to equation.
para - Parallel vector resolute.
pder - Derivative of a parametric equation.
perp - Perpendicular vector resolute.
poi - Points of interest of a function.
sd - Standard deviation.
spara - Scalar resolute.
trans - Transform a function.
var - Variance.