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From the following functions, choose the function which is surjective.
f:R\rightarrow R, f(x) = (x-2)^2+1
k:R\rightarrow R, k(x) =|x|
h:R\rightarrow R, h(x) = 3e^{x-1}-2
g:R^{+}\rightarrow R^{+}, g(x) =x^2
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