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

Let `f: R ->[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 (a)`(0,oo)` (b) `[2,1]` (c) `[1/4,oo)` (d) none of these

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