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The sum of the series Σ coesc^-1 √4r^4 + 1 ; r=1, ∞ is

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in Algebra by (53.6k points)

The sum of the series \(\sum\limits_{r =1}^\infty cosec^{-1} \sqrt{4r^4 + 1}\) is 

(a) π

(b) π/2

(c) π/4

(d) None of these

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1 Answer

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by (53.3k points)

Correct option is (c) π/4

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