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Question Number 12885 by FilupS last updated on 05/May/17

$$f\left(f\left(x\right)\right)=f^2\left(x\right)$$$$$$$$\mathrm{What}\mathrm{is}\mathrm{a}\mathrm{solution}?$$

Answered by mrW1 last updated on 05/May/17

$$u=f\left(x\right)$$$$\Rightarrow f\left(u\right)=u^2$$$$\Rightarrow f\left(x\right)=x^2$$

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