हिंदी

If f : R → R be given by f(x) = (3 – x^3)^1/3, then fof(x) = ______. - Mathematics

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प्रश्न

If f : R → R be given by f(x) = (3 – x3)1/3, then fof(x) = ______.

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उत्तर

If f: R → R be given by f(x) = (3 – x3)1/3, then fof(x) = x.

Explanation:

f(x) = (3 – x3)1/3

fof(x) = f[f(x)]

fof(x) = f[3 – x3]1/3

= [3 – ((3 – x3)1/3)3]1/3

= [3 – (3 – x3)]1/3

= [3 – 3 + x3]1/3

= (x3)1/3

= x

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