Question: In Problems 21100, establish each identity. (sina + cos 3) + (cos + sina) (cos 3 - sina) = 2 cos3(sina + cos 3)

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

(sina + cos 3) + (cos + sina) (cos 3 - sina) = 2 cos3(sina + cos 3)

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