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Math Help - solve all values of x

  1. #1
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    solve all values of x

    Solve for all values of x.

    2cos^2(x) + 3 sin(x) = 0


    How do i do these?
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  2. #2
    Master Of Puppets
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     2\cos^2(x) + 3 \sin(x) = 0

    Lets make that cos into sin

     2(1-\sin^2(x)) + 3 \sin(x) = 0

    Now expand that out, then make a sub a = \sin(x) and solve the quadratic in a.
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