if A+B+C=pi prove that a)cos(B-C)+cosA=2sinBsinC

Question

ng29 · Answer

its quite easy , in this type of questions generally substitute one angle in terms of other put 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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if A+B+C=pi prove that a)cos(B-C)+cosA=2sinBsinC

if A+B+C=pi prove that
a)cos(B-C)+cosA=2sinBsinC

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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

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if A+B+C=pi prove that
a)cos(B-C)+cosA=2sinBsinC