QuestionSimplify the expression $\cot \left(\sin ^{-1}\left(\frac{x}{2}\right)\right)$. Choose one correct answer from given answers. $\frac{-\sqrt{x^{2}+4}}{x}$ $\frac{\sqrt{x^{2}-4}}{x}$ $\frac{\sqrt{x^{2}+4}}{2 x}$ $\frac{\sqrt{-x^{2}+4}}{x}$