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Let f(x)=cot^(-1)(x^2+4x+alpha^2-3alpha)...

Let `f(x)=cot^(-1)(x^2+4x+alpha^2-3alpha)` be a function defined on `R->(0,pi/2]` , is an onto function then
(a)`alpha in [-1,4]` (b) `alpha in {-1,4}` (c)`f(x)` is one-one (d) `f(x)` is many-one

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