Linearizations 89 v1.0     By Jake Griffin (Jrock7286@aol.com)

lineariz is a function that returns the linearization (the equation of the tangent)
of a function of any number of variables at a point.  Great for Calculus!

Syntax:
lineariz(function, variable list, point list)

Examples:
lineariz(sin(x),{x},{Pi})              -> f(x)=Pi-x
lineariz(x^2+y^2+z^2,{x,y,z},{1,2,3})  -> f(x,y,z)=2x+4y+6z-14