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Math Help - help solving identity simple problem

  1. #1
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    help solving identity simple problem

    I'm confused at how to use identities to solve problems such as sin(2theta)sin theta = cosine theta? Another example of a problem would be sin(2 theta) = cosine theta
    Can anyone help?
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  2. #2
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    Quote Originally Posted by micbal9388 View Post
    I'm confused at how to use identities to solve problems such as sin(2theta)sin theta = cosine theta?

    Maybe try

     \sin 2\theta \sin \theta = \cos\theta

     2\sin \theta \cos\theta \sin \theta = \cos\theta

     2\sin \theta \sin \theta = 1

     2\sin ^2\theta = 1

     \sin ^2\theta = \frac{1}{2}

     \sin \theta = \frac{1}{\sqrt{2}}

    Can you finish it from here?
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