3d Taylor Polynomials v1.0     By Jake Griffin (Jrock7286@aol.com)

taylor3d is a function that finds the mth-by-nth degree taylor polynomial of a 3-d
function at a point.  Great for Physics and Calculus!

Syntax:
taylor3d(function, {x-deg , y-deg.}, {x-pt , y-pt.})

Examples:
taylor3d(cos(x^2+y^2),{0,0},{0,0})   -> 1
taylor3d(cos(x^2+y^2),{3,3},{0,0})   -> 1-x^2*y^2
taylor3d(cos(x^2+y^2),{1,0},{Pi,Pi}) -> 15.9641-4.88111x
taylor3d(cos(x^2+y^2),{1,2},{Pi,0})  -> 5.67174xy^2+2.70366x-17.388y^2-9.39649