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The graph of a function $f(x)$ is given below.

a decreasing s-shaped function with a horizontal tangent at (1,-2)

Find a possible formula for $f(x)$ whose graph is illustrated above by using a shift of either $x^2$ , $-x^2$ , $x^3$ or $-x^3$ . Point $A$ has coordinates $(1,-2)$ .
$f(x)$ = .