MCQOPTIONS
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| 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. \[-{{n}^{2}}y\] | |