Mathematics, 05.05.2021 15:50 BFBtrent

Prove: cos (x + y) = (cos x )(cos y ) + (sin x)(sin y) Please help need a written explain of proof

Prove: cos (x + y) = (cos x )(cos y ) + (sin x)(sin y)

Please help need a written explain of proo

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Prove: cos (x + y) = (cos x )(cos y ) + (sin x)(sin y) Please help need a written explain of proof...

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