$\large \dfrac{d}{dx} \, \cot{x} = -\csc^2{x}$ (or) $-operatorname{cosec}^2{x}
It is read as the derivative (or) differentiation of cot of angle $x$ with respect to $x$ is equal to square of negative cosecant of angle $x$.
Learn how to derive differentiation of $\cot{x}$ formula in calculus.
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