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Math Help - derive identity help

  1. #1
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    derive identity help

     <br />
\frac{\cos\theta\tan\theta + \sin\theta}{\tan\theta} = 2\cos\theta<br />


    help deriving this identity. thank you
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by jvignacio View Post
     <br />
\frac{\cos\theta\tan\theta + \sin\theta}{\tan\theta} = 2\cos\theta<br />


    help deriving this identity. thank you
    Note that \cos\vartheta\tan\vartheta=\sin\vartheta and \tan\vartheta=\frac{\sin\vartheta}{\cos\vartheta}

    Can you try and see if you can establish this identity?

    --Chris
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  3. #3
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    Quote Originally Posted by Chris L T521 View Post
    Note that \cos\vartheta\tan\vartheta=\sin\vartheta and \tan\vartheta=\frac{\sin\vartheta}{\cos\vartheta}

    Can you try and see if you can establish this identity?

    --Chris
    no im not very familiar with identities
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  4. #4
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    Those are basic ones, better you review some of trig.
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