$\frac{d}{d x}(\cot (2 \sqrt{x}))=$ কত ?

$\frac{-\operatorname{cosec}^{2}(2 \sqrt{x})}{2 \sqrt{x}}$

$\frac{-\operatorname{cosec}^{2}(2 \sqrt{x})}{\sqrt{x}}$

$-\operatorname{cosec}^{2}(2 \sqrt{x})$

$\frac{\operatorname{cosec}^{2}(2 \sqrt{x})}{2 \sqrt{x}}$