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Math Help - Does this identity proof make sense?

  1. #1
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    Does this identity proof make sense?

    Hi,

    Would anyone mind taking a look at the proof in the link below and telling me if it's correct? It's different from the one in the answer key so I'm not sure if I've done something wrong.

    http://i.imgur.com/tcsRvnc.jpg

    Thanks!
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  2. #2
    Forum Admin topsquark's Avatar
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    Re: Does this identity proof make sense?

    Quote Originally Posted by KevinShaughnessy View Post
    Hi,

    Would anyone mind taking a look at the proof in the link below and telling me if it's correct? It's different from the one in the answer key so I'm not sure if I've done something wrong.

    http://i.imgur.com/tcsRvnc.jpg

    Thanks!
    Looks good to me. There can be many ways to do these problems so don't worry about the method.

    However, "sin" means nothing. You need to put the sin(x) etc. to write these correctly. For example, what would you do if you had a sin(2x)?

    -Dan
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  3. #3
    Senior Member Paze's Avatar
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    Re: Does this identity proof make sense?

    Looks good from here too.
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  4. #4
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    Re: Does this identity proof make sense?

    Thanks guys!
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