CAUTION: This function is still being developed and may have errors. I haven't done any testing with three or more variables. Check all your work.

Expr: The function to be approximated. 

VarOrList: The variable or a list of variables to consider in the approximation. Variables not listed will be treated as constants. 

Order: The order of the power series desired. 

PointOrList: The point or a list of points corresponding to the variable in VarOrList.

Return value: (EXPR)
The Taylor or McLaurin approximation.

Examples: 
1.  taylr(e^xyz, {x, y, z}, 1, {1,1,1})
     e(x+y+z-2)