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OpenStudy (anonymous):
cos^2 2x - cos^2 6x = sin 4x sin 8x.
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OpenStudy (anonymous):
What you are supposed to do in this??
OpenStudy (anonymous):
prove LHS = RHS.
OpenStudy (anonymous):
Okay I am trying..
OpenStudy (anonymous):
thank you :)
OpenStudy (anonymous):
I tried but I am not getting the solution.. Sorry..
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