1.

If ((x+1)^(2))/(x^(3)+x)=(A)/(x)+(Bx+C)/(x^(2)+1), then "cosec"^(-1) ((1)/(A)) + cot^(-1) ((1)/(B))+sec^(-1)C=______

Answer»

a. `(PI)/(2)`
B. `(pi)/(6)`
c. 0
d.`(5pi)/(6)`

Answer :D


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