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If $$0 < x < 1$$, then$$\sqrt{1 + x^2}[\left\{x \cos (\cot^{-1} x) + \sin(\cot^{-1} x)\right\}^2 - 1]^{\frac{1}{2}}=$$
$$\frac{x}{\sqrt{1 + x^2}}$$
$$x$$
$$x\sqrt{1 + x^2}$$
$$\sqrt{1 + x^2}$$
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