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JEE MATHEMATICS MCQ: INDEFINITE INTEGRATION

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Application +4 | -1
If ∫  [log⁡ (log⁡  x)  +  1(log⁡  x)2]dx=x  [ f(x)  −  g(x) ]  +  c\int \,\,\left[ {\log \,(\log \,\,x)\,\, + \,\,\frac{1}{{{{\left( {\log \,\,x} \right)}^2}}}} \right]dx = x\,\,\left[ {\,f\left( x \right)\,\, - \,\,\mathrm{g}\left( x \right)\,} \right]\,\, + \,\,c, then
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Correct option: A
f  (x)=log⁡ (log⁡  x);  g(x)=1log⁡  xf\,\,\left( x \right) = \log \,(\log \,\,x);\,\,\mathrm{g}\left( x \right) = \frac{1}{{\log \,\,x}}
Option A (f  (x)=log⁡ (log⁡  x);  g(x)=1log⁡  xf\,\,\left( x \right) = \log \,(\log \,\,x);\,\,\mathrm{g}\left( x \right) = \frac{1}{{\log \,\,x}}) is correct because after integrating by parts, the resulting expression matches the given form with these functions.

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