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Thread: how do I do this trig addition formula problem?

  1. April 1st 2009, 02:02 PM #1
    RaphaelB30
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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. April 1st 2009, 02:27 PM #2
    skeeter
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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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