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a
1+x1+log x
b
1−log x1+log x
c
not defined
d
log x(1+log x)2
answer is D.
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Detailed Solution
Since, xy=ex−yTaking log on both sides, we get ylog x=(x−y)loge e⇒ y=x1+log xOn differentiating w.r.t. x, we getdydx=(1+log x)−x⋅1x(1+log x)2=log x(1+log x)2