Test Academy | If f:R→R is given by f(x)=(5+x4)1/4, then fοf(x) is x, 10+x⁴, 5+x⁴, (10+x⁴)¹/⁴

Question

If f:R→R is given by f(x)=(5+x4)1/4, then fοf(x) is

Options :

x
10+x⁴
5+x⁴
(10+x⁴)¹/⁴

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