1.

int_(0)^(oo) (45a)/((3+a+a t)^(4))dt=

Answer»

`(15)/((3+a)^(2))`
`(15)/((3+a)^(3))`
`(15)/(3(3+a)^(3))`
`(15)/(a(3+a)^(2))`

ANSWER :B


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