ConceptTrigonometric Ratios of Complementary Angles

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#### Question

If A, B and C are interior angles of a triangle ABC, then show that `\sin( \frac{B+C}{2} )=\cos \frac{A}{2}`

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#### Reference Material

Solution for question: If A, B and C are interior angles of a triangle ABC, then show that sin((B+C)/2)=cos(A/2) concept: Trigonometric Ratios of Complementary Angles. For the course CBSE