Differentiate y= In ( 2cot²x )
"y'=\\frac{1}{2cot^2(x)}\\cdot 2\\cdot2cot(x)\\cdot (-\\frac{1}{sin^2(x)})=\\\\\n=-\\frac{2}{sin^2(x)cot(x)}=-\\frac{2}{sinxcosx}"
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