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Topic:  help needed to verify 
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Subject:  Trig Identity 
Author:  Chuck 
Date:  Feb 19 2004 
correctly?
I suspect that what you are trying to prove will need the Pythagorean
Identity:
sin squared x + cos squared x = 1,
so that 1  sin squared x = cos squared x and 1  cos squared x = sin squared
x.
 
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