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Let f: PvecQ defined by f(x)=4x-x^2 is a...

Let `f: PvecQ` defined by `f(x)=4x-x^2` is a bijective function if `P=[2,oo],Q in (-oo,4]` b. `P=[2,oo],Q in [4,oo)` c. `P=(-oo,2],Q in (4,oo]` d. `P=[-oo,2],Q in (-oo,4]`

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