Hi quick & easy question: 6 cos 4x = 6 sin 8x cos 4x = sin 8x cos 4x = 2 sin 4x cos 4x 1/2 = sin 4x arcsin(1/2) = 4x x = arcsin(1/2)/4 are the above steps correct? If so, how can i find x in terms of pi? Thanks.
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Not quite. Dividing through by is potentially dividing by 0 so instead move all terms onto one side and factor Either (these are the solutions you miss if you divide) or As for recall your unit circle to see that
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