prove that cos^2A+cos^2(A+120)+ cos^2(A-120)=3/2cos^2A+cos^2(A+60)+cos^2(A-60)

Asked by Aarthi Vishwanathan | 1st Jun, 2012, 08:38: PM

Expert Answer:

Answered by  | 6th Jun, 2012, 12:16: PM

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