verify the identities a.) (cos 8x + cos 4x) / (sin 8x - sin 4x) =...

verify the identities

a.) (cos 8x + cos 4x) / (sin 8x - sin 4x) = Cot(2x)

b.) tan^2(x/2) = 1 - 2cot(x)csc(x) + 2Cot^2x

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