2cos^2(A/2)-2sin(3A/2)sin(A/2)=cos2A+1 [Archive]

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tinapandaa

Jul 3, 2014, 08:17 AM

prove 2cos^2(A/2)-2sin(3A/2)sin(A/2)=cos2A+1

smoothy

Jul 3, 2014, 08:19 AM

Since this is homework... show us what you have and how you got it (your answer and your work)... then we will tell you if you did it right or not... but we don't do your assignments for you.