NDA Math Indefinite Integrals

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For the next two (02) items that follow:
Consider
∫xtan−1xdx=A(x2+1)tan−1x+Bx+C

where C is the constant of integration.
[NDA II 2014]
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Question : 37 of 38
 
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What is the value of A ?
[NDA II 2014]
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