If $ y=\cot ^{-1}\left(\frac{\sqrt{1+\sin x}+\sqrt{1-\sin x}}{\sqrt{1+\sin x}-\sqrt{1-\sin x}}\right) $ then $ \frac{d^{2} y}{d x^{2}} $ is equal to [JEE Main 2021, 27 Aug (Shift 2)]

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If \( y=\cot ^{-1}\left(\frac{\sqrt{1+\sin x}+\sqrt{1-\sin x}}{\sqrt{1+\sin x}-\sqrt{1-\sin x}}\right) \) then \( \frac{…

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