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OpenStudy (cutiecomittee123):
1-cos(6x)= 3cos(2x) 3sin(2x) 2cos^2(3x) I think it is b, since 1-cos^2=sin^2 but in the inital equation we arent dealing with cos^2. Can someone give me some pointers?
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OpenStudy (tkhunny):
If only we had an actual problem statement...
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