1.

The value ofSigma_(n=1)^(infty) cot^(-1) ( n^(2) + n +1) is also equal to

Answer»

`cot^(-1)(-1)+sec^(-1)(1)- COSEC^(-1)(1)`
`cot^(-1)(2) + cot^(-1)(3)`
minimum value of the function `f(x) = TAN^(-1) ((1-x^(2))/(1+x^(2)))`
`COS^(-1)(cos 41 pi/4)`

Answer :A::B::D


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