if A,B and c are interior angle of a triangle ABC then show that
sin (B+C) =cos
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Sin[(B+C)/2]
Since A+B+C=180 for interior angles of triangle ABC.
then B+C=180-A.
NOW Sin [(180-A)/2]
=Sin[90-(A/2)] since Sin(90-A)=CosA
=Cos(A/2)
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