if A+B+C=pi prove thata)cos(B-C)+cosA=2sinBsinC
if A+B+C=pi prove that
a)cos(B-C)+cosA=2sinBsinC
sumanth , 10 Years ago
Grade 12th pass
Trigonometry> if A+B+C=pi prove that a)cos(B-C)+cosA=2s...
1 Answers
ng29
Last Activity: 10 Years ago
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)) = β cos(B+C)
now u can easily get answer
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