The antiderivative of f(x)=log(logx)+(logx)−2 whose graph passes through (e,e) is
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a
xlog(logx)+(logx)−1
b
x−log(logx)+(logx)−1+e
c
xlog(logx)−(logx)−1+2e
d
none of these
answer is C.
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Detailed Solution
An antiderivative of f (x) = F(x) =∫log(logx)+(logx)−2dx+C=xlog(logx)−∫xxlogxdx+∫(logx)−2dx+C (integrating by parts the first term) =xlog(logx)−x(logx)−1+∫(logx)−2dx+∫(logx)−2dx+C (again integrating by parts (logx)−1 =xlog(logx)−x(logx)−1+CPutting x=e we have e=0−e+C so C=2eThus F(x)=xlog(logx)−(logx)−1+2e