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Trigonometry expansions


Has anyone taken the time to define  trigonometric simplifications
of the form:

        Sin[ArcSin[x]]  -> x
        Sin[ArcTan[x/y]] ->  y/Sqrt[x^2+y^2]

               etc.

that can be added to the Algebra/trigonometry package???



--
Steven Warwick

Hewlett-Packard
sdw at hpsad



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