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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Originally Posted by Tmiles 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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