Mathematics

Mathematics, 04.07.2020 22:01, weitz3584

can someone help me please? If sinx + siny = - 21/65 and cosx + cosy = - 27/65 , then find cos((x-y)/2)

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can someone help me please? If sinx + siny = - 21/65 and cosx + cosy = - 27/65 , then find cos((x-y)...

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