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OpenStudy (anonymous):
cos2x-cos4x can't be simplified any further? Like it wouldn't be cos(-2x)?
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OpenStudy (anonymous):
You are correct. It can not be simplified any further. The 2x and 4x are the arguments.
OpenStudy (anonymous):
It can be expanded using trig identities. 2 (1+2 cos(2 x)) sin^2(x)
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