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?
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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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