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Find if the given function is bijective or not.

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Which of the following is a bijection on set of all real numbers.

$(1)f(x) = x{^2} $

$(2)g(x) = |x|$

$(3)h(x) = \left \lfloor x \right \rfloor$

$(4)\phi(x)$ = $x^3$

How to proceed in such questions.
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