did I do this correctly so far? sinxcosx+0.5=sin^2 x -sin^2 x + sinxcosx = -0.5 -sin x (sin x - cos x) = -0.5 sin x (sin x - cos x) = 0.5 If I did this correctly so far where do I go from here?
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Hello yoman360 Originally Posted by yoman360 did I do this correctly so far? sinxcosx+0.5=sin^2 x -sin^2 x + sinxcosx = -0.5 -sin x (sin x - cos x) = -0.5 sin x (sin x - cos x) = 0.5 If I did this correctly so far where do I go from here? This would be OK if you had zero on the RHS. The best way to go is to use the double-angle formulae: and Now use the fact that and get: Grandad
Hello, yoman360! Grandad is right . . . We need another approach. We have: . Hence: .
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