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Show that the function `f : R to ` defined by `f (x) = x^(3) + 3` is invertible. Find `f^(-1)` . Hence find `f^(-1) (30)`

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The correct Answer is:
`f^(-1) : R to R` such that `f^(-1) (y) = (y - 1)^((1)/(3)) ; f^(-1) (30) = 3 `
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