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Math Help - Solve Trig eqauions

  1. #1
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    Solve Trig eqauions

    Solve, finding all solutions in 0<x<=360

    1. Sin4x-2sin2x=0

    I know I'm going to need to use the double-angle and/or sum to product identities but i'm not sure how to proceed.

    2. Sin2xCosx+Sinx=0

    similar to above. Can anyone help me please?
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  2. #2
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    Quote Originally Posted by Tmiles View Post
    Solve, finding all solutions in 0<x<=360

    1. Sin4x-2sin2x=0

    I know I'm going to need to use the double-angle and/or sum to product identities but i'm not sure how to proceed.

    2. Sin2xCosx+Sinx=0

    similar to above. Can anyone help me please?
    In each case, substitute sin(2x) = 2 sin(x) cos(x) and factorise by taking out a common factor of sin(x). Then use the null factor law etc.
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