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From the following functions, choose the function which is injective .

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From the following functions, choose the function which is injective.

$k:\mathbb{R}\rightarrow \mathbb{R}^{+}, k(x) =3e^{x-1}$ k:\mathbb{R}\rightarrow \mathbb{R}^{+}, k(x) =3e^{x-1}

✅

$f:\mathbb{R}\rightarrow \mathbb{R}, f(x) = (x-2)^2+1$ f:\mathbb{R}\rightarrow \mathbb{R}, f(x) = (x-2)^2+1

❌

$h:\mathbb{R}\rightarrow \mathbb{R}, h(x) = x^3-2x^2-x+2$ h:\mathbb{R}\rightarrow \mathbb{R}, h(x) = x^3-2x^2-x+2

❌

$g:\mathbb{R}\rightarrow \mathbb{R}^{+}\cup {0}, g(x) =x^2$ g:\mathbb{R}\rightarrow \mathbb{R}^{+}\cup {0}, g(x) =x^2

❌

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