If , then prove that , when…

MATHEMATICS · Subjective · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

If A+B+C=180∘A + B + C = 180^\circ , then prove that tan⁡2θ2=tan⁡B2tan⁡C2\tan^2 \frac{\theta}{2} = \tan \frac{B}{2} \tan \frac{C}{2} , when cos⁡θ(sin⁡B+sin⁡C)=sin⁡A\cos \theta (\sin B + \sin C) = \sin A .

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