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JEE MATHEMATICS MCQ: INDEFINITE INTEGRATION

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Application +4 | -1
∫  x51  (tan⁡−1  x  +  cot⁡−1  x)  dx\int \,\,{x^{51}}\,\,\left( {{{\tan }^{ - 1}}\,\,x\,\, + \,\,{{\cot }^{ - 1}}\,\,x} \right)\,\,dx
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Correct option: A
x5252  (tan⁡−1  x  +  cot⁡−1  x)  +  c\frac{{{x^{52}}}}{{52}}\,\,\left( {{{\tan }^{ - 1}}\,\,x\,\, + \,\,{{\cot }^{ - 1}}\,\,x} \right)\,\, + \,\,c
Option A (x5252 (tan⁡−1 x + cot⁡−1 x) + c\frac{{{x^{52}}}}{{52}}\,\left( {{{\tan }^{ - 1}}\,x\, + \,{{\cot }^{ - 1}}\,x} \right)\, + \,c) is correct because it correctly uses the identity tan⁡−1x+cot⁡−1x=π2\tan^{-1}x + \cot^{-1}x = \frac{\pi}{2} and integrates the resulting expression.

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