Let f: Rvec[0,pi/2) be defined by f(x)=t...

Let `f: Rvec[0,pi/2)` be defined by `f(x)=tan^(-1)(x^2+x+a)dot` Then the set of values of `a` for which `f` is onto is `(0,oo)` (b) `[2,1]` (c) `[1/4,oo]` (d) none of these

A

`(81, infty)`

B

`[81,infty)`

C

`(- infty, 81)`

D

`(- infty, 81]`

Text Solution

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The correct Answer is:

A

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