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Math Help - how do I do this trig addition formula problem?

  1. #1
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    how do I do this trig addition formula problem?

    I have a list of a bunch of addition properties
    Here's the problem. Thanks for your help.

    2 cosē10°-1
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  2. #2
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    Quote Originally Posted by RaphaelB30 View Post
    I have a list of a bunch of addition properties
    Here's the problem. Thanks for your help.

    2 cosē10°-1
    note the double angle identity ... \cos(2x) = 2\cos^2{x} - 1
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