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Math Help - Trig Equation

  1. #1
    Member classicstrings's Avatar
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    Trig Equation

    Is there a way to get a exact value to 15 = tan(3x) ?

    If there isn't I will post the original equation whereby I reached it, and perhaps there is a way.
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  2. #2
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    tan 3x=15
    3x=tan^-1(15)
    x=[tan^-1(15)]/3
    x=28.72864172
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  3. #3
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    Quote Originally Posted by classicstrings View Post
    Is there a way to get a exact value to 15 = tan(3x) ?

    If there isn't I will post the original equation whereby I reached it, and perhaps there is a way.
    Please post the original equation as I can't see how to get the exact value.

    @alinailiescu

    It asks for exact value, In the UK, this usually means no calculators can be used.
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  4. #4
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    Than you shoul stop at this step. Note that tan^-1 is the invers function of tan. Noted also arctan or atan, to avoid confusion with 1/tanx=(tanx)^-1
    tan 3x=15
    3x=tan^-1(15)
    x=[tan^-1(15)]/3
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  5. #5
    Member classicstrings's Avatar
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    Well here it is:

    5(-0.2e^(-0.2x)sin(3x) + e^(-0.2x)3cos(3x)) = 0
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