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Math Help - Trigonometric equation w/ different functions on either side.

  1. #1
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    Joined
    Mar 2008
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    Angry Trigonometric equation w/ different functions on either side.

    I could kill my math book for not having a similar example. I honestly don't even remember going over this.

    cos x+11=sin 3x-9 ; Find x

    I think what's really confusing me is the different functions on either side. The book has examples for quadratics, but nothing similar to this. I tried roundabout logic a few times, but I'm still having trouble with the setup/completion.

    I don't neccesarily need the answer, but how to solve.

    ~Wynne
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  2. #2
    Newbie DavePercy's Avatar
    Joined
    Feb 2008
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    Try isolating one of the functions on one side of the equation, then squaring both sides. You can use the Pythagorean Identity on the isolated function and rearrange to get a quadratic you can solve.
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