Question

How do you determine if a function is invertible?

Answer 1

we determine the function is invertible when the function is one-one and onto(bijective).
if these two conditions are satisfied the function is invertible.
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Answer 2

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In mathematics, an inverse function (or anti-function) is a function that "reverses" another function: if the function f applied to an input x gives a result of y, then applying its inverse function g to y gives the result x, and vice versa, i.e., f(x) = y if and only ifg(y) = x.