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Math Help - Help with solving trigometric equations?

  1. #1
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    Help with solving trigometric equations?

    I don't understand how to do these problems very well..
    I'll type out what i did so far if i tried..
    15sin^2x-26sinx+8=0
    sinx(15sinx-26)+8=0

    16sin^3x-12sin^2x+26sinx-27=0
    4sin(4sin^2x-3sinx)+9(4sinx-3)=0

    (root2 sinx+1)(3tan3x-root3)=0

    sin 3x=-root2/2
    for this one, i don't know what to do with the 3x. I heard that there is supposed to b 6 answers when the multiple of the angle is 3, but how do i find this?

    If I have more trigometric equations problems, should I update this thread, or just start a new one?
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  2. #2
    Super Member bigwave's Avatar
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    15sin^{2}X - 26sinX + 8 = 0

    this factors into

    \left(3sinX - 4\right)\left(5sinX - 2\right) = 0

    can you solve from here??
    Last edited by bigwave; December 2nd 2009 at 11:58 PM. Reason: wording
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