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if A+B+C=pi prove that a)cos(B-C)+cosA=2sinBsinC if A+B+C=pi prove thata)cos(B-C)+cosA=2sinBsinC
its quite easy , in this type of questions generally substitute one angle in terms of otherput A= pi -(B+C) now cos A becomes cos(pi -(B+C)) = – cos(B+C)now u can easily get answer APPROVE IF USEFUL
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