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Mathematics, 12.06.2021 14:00 tyree111

If P t Q + R = 180 prove that
sinP + sinQ+ sinR = 4 cosP÷2 ×cosQ÷2 × cosR ÷ 2

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If P t Q + R = 180 prove that
sinP + sinQ+ sinR = 4 cosP÷2 ×cosQ÷2 × cosR ÷ 2
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