What is cos of 2 theta?

Cos(A + B) = cosAcosB - sinAsinB, with A=B cos(2A) = cos 2 A - sin 2 A then you can use cos 2 A + sin 2 A = 1, to produce more, like: 2cos 2 A - 1 or 1 - 2sin 2 A and others.

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