\( y=\left(x-\sqrt{1+x^{2}}\right) ; \) prove that \( \left(1+x^{2}\right)\left(\frac{d y}{d x}\...

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\( y=\left(x-\sqrt{1+x^{2}}\right) ; \) prove that \( \left(1+x^{2}\right)\left(\frac{d y}{d x}\right)^{2}=y^{2} \)
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