Question: In Problems 21100, establish each identity. (sin a cos 3) + (cos + sina) (cos sina) = -2 cos (sina cos/3)

In Problems 21–100, establish each identity.(sin a cos 3) + (cos + sina) (cos sina) = -2

(sin a cos 3) + (cos + sina) (cos sina) = -2 cos (sina cos/3)

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