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Mathematics for IGCSE & O level - Functions (Section 2 - No. 18)

If f(x) = x^2, what is f(f(x))?
x^4
x^2 + x^2
2x^2
x^2

Paskaidrojums

f(f(x)) = f(x^2) = (x^2)^2 = x^4

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