Shadowing :cl functions

Hi,
	I was thinking we could just shadow functions like sin, cos, tan.. and
replace them with generic functions and define methods for matrix
classes. I have read something about this being slow runtime-wise, not
sure though.

I can see why this would be a bad idea, because of issues in using
Matlisp classes in other packages. Maybe we can create a package which
overloads things for better user interaction ?

Akshay

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