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  4. lim n → ∞ ∑ nr=1 Tan-1((2r/r4 + r2 + 2 )) =

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Q. $\lim _{n \to \infty } \sum ^{n}_{r=1} Tan^{-1}\left(\frac{2r}{r^{4} + r^{2} + 2 }\right) = $

AP EAMCETAP EAMCET 2018

Solution:

Correct answer is (a) $\frac{\pi}{4}$