Question: In Problems 21100, establish each identity. (2 cos0 cos40 - - 1) sin 40 = 12 sin 20

In Problems 21–100, establish each identity.(2 cos0 cos40 - - 1) sin 40 = 12 sin 20

(2 cos0 cos40 - - 1) sin 40 = 12 sin 20

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