1.

\[\frac{d}{dx}{{\left( \sqrt{x}+\frac{1}{\sqrt{x}} \right)}^{2}}=\]                         [AI CBSE 1980]

A.            \[1-\frac{1}{{{x}^{2}}}\]
B.            \[1+\frac{1}{{{x}^{2}}}\]
C.            \[1-\frac{1}{2x}\]
D.            None of these
Answer» B.            \[1+\frac{1}{{{x}^{2}}}\]


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