Teaching UP TGT Mock Test Series 2025 Mathematics Relations and Functions

Which one of the following functions is not one-one?

1
f : (-1, ∞) → R given by f(x) = x2 + 2x
2
g : (1, ∞) → R given by g(x) = \(e^{x^3-3 x+2}\)
3
h : R → R given by h(x) = \(2^{x(x-1)}\)
4
ϕ : (-∞, 0) → R given by ϕ(x) = \(\frac{x^2}{x^2+1}\)
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