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Math Help - Little trig identity question.

  1. #1
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    Little trig identity question.

    Since 1 - cos^2 x = sin^(2)x does that mean 1 - cos^(2)3x = sin^(2)3x?
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  2. #2
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    Hello again
    Quote Originally Posted by cjh824 View Post
    Since 1 - cos^2 x = sin^(2)x does that mean 1 - cos^(2)3x = sin^(2)3x?
    Exactly !

    x is just a name, you can put anything you want in it
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