Question: In Problems 2542, establish each identity. 1 + cos(20) + cos(40) + cos(60) = 4 cos@cos(20) cos(30)

In Problems 25–42, establish each identity.1 + cos(20) + cos(40) + cos(60) = 4 cos@cos(20) cos(30)

1 + cos(20) + cos(40) + cos(60) = 4 cos@cos(20) cos(30)

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