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cos 2 theta half angle identity
cos 2 identity half angle
cos half angle identity
identity of cos 2 theta
half angle identity cos 2x
cos theta - sin theta identity
cos 2 theta trig identity
cos theta half angle formula
sin theta + cos theta identity
cosine half angle identity
cosine 2 theta identity
cos theta squared identity
cos 3 theta identity
cos 2 theta half angle identity, cos 2 identity half angle, cos half angle identity, identity of cos 2 theta, half angle identity cos 2x, cos theta - sin theta identity, cos 2 theta trig identity, cos theta half angle formula, sin theta + cos theta identity, cosine half angle identity, cosine 2 theta identity, cos theta squared identity, cos 3 theta identity
