could you help me on the following, rcosxcosy * rsinxcosy -rsinxsiny * sinxsiny
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-Kevin C.
cheers mate. now could you possibly help me simplify the following plz, cosx[(r^2sinxcos^2y) - (r^2sinxcosxsin^2y)] (-rsinx)[(rsin^2xcos^2y) - (-rsin^2xsin^2y)] I'm sorry i'm askin for help, i kno this must be easy, but i can't do it. lol
try using the following identities: you might also take a look at this: Table of Trigonometric Identities
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