1) If y= 2x/Inx then $\frac{dy}{dx}$ at x=e is A) e B) $2^{e}\log e$ C) $\log e$ D) 0 Answer: Option DExplanation:$\log y= \frac{x}{\log x}\log 2$ $\Rightarrow\frac{dy}{dx}]_{x=e}=0$