Mathematics, 01.04.2021 23:50 AleciaCassidy

Given that A, B and C are angle of a triangle prove that: sin B + sin C = 2cos A/2 cos B-C/2

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Given that A, B and C are angle of a triangle prove that: sin B + sin C = 2cos A/2 cos B-C/2...

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Given that A, B and C are angle of a triangle prove that: sin B + sin C = 2cos A/2 cos B-C/2​

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Given that A, B and C are angle of a triangle prove that: sin B + sin C = 2cos A/2 cos B-C/2