1.

If \[y={{(x+\sqrt{1+{{x}^{2}}})}^{n}},\] then \[(1+{{x}^{2}})\frac{{{d}^{2}}y}{d{{x}^{2}}}+x\frac{dy}{dx}\] is

A. \[{{n}^{2}}y\]
B. \[-{{n}^{2}}y\]
C. \[-y\]
D. \[2{{x}^{2}}y\]
Answer» B. \[-{{n}^{2}}y\]


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