Solve- b-csinA2-acosB-C2-

b+c=2Rsin B+2Rsin C=4Rsin(B+C2)cos(B C2)=4RcosA2cosB C2 (b+c)sinA2=2RcosB C2(2sinA2cosA2)=2RcosB C2sin A=acosB C2 ...

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Trigonometric Ratios of Allied Angles

Solve: b+csi...

Question

Solve:
$(b + c) sin \frac{A}{2} = a cos \frac{B - C}{2}$ .

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Solution

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