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Question

In triangle ABC a,b,c are the length of its sides and A,B,C are the angles of triangle ABC. The correct relation is given by

A
(bc)sin(BC2)=acosA2
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B
(bc)cos(A2)=asinBC2
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C
(b+c)sin(B+C2)=acosA2
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D
(bc)cos(A2)=asinB+C2
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