Working with half-angle identity
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Cos x (using the half-angle identity)© BrainMass Inc. brainmass.com May 24, 2023, 1:14 pm ad1c9bdddf
We have the half angle identity for cos x as,
cos x = +-sqrt[(1 + cos 2x)/2]
also, cos 7pi/12 = cos ...
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