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Math Help - Finding a sum of sines and cosines.

  1. #1
    arm
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    Finding a sum of sines and cosines.

    Find:  S=4. sin^{2}10 + 4 sin^{2}50.cos20 + cos80
    Last edited by mr fantastic; February 26th 2011 at 01:02 PM. Reason: Re-titled.
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  2. #2
    Flow Master
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    Quote Originally Posted by arm View Post
    Find:  S=4. sin^{2}10 + 4 sin^{2}50.cos20 + cos80
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