simplify ( derivative ( ln (abs(tan(x/2))) 3/8 cos(x) / (sin(x))^2 - 1/4 cos(x) / (sin(x))^4 ) )simplify ( derivative ( ln (abs(tan(x/2))) 3/8 cos(x) / (sin(x))^2 - 1/4 cos(x) / (sin(x))^4 ) )

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