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Question Number 200885 by cortano12 last updated on 26/Nov/23
    x
$$\:\:\:\:\cancel{\underline{\underbrace{\boldsymbol{{x}}}}} \\ $$
Commented by cortano12 last updated on 26/Nov/23
   f
$$\:\:\:\boldsymbol{\mathfrak{f}} \\ $$
Answered by Frix last updated on 26/Nov/23
a^4 +b^4 +(a+b)^4 =2(a^2 +ab+b^2 )^2
$${a}^{\mathrm{4}} +{b}^{\mathrm{4}} +\left({a}+{b}\right)^{\mathrm{4}} =\mathrm{2}\left({a}^{\mathrm{2}} +{ab}+{b}^{\mathrm{2}} \right)^{\mathrm{2}} \\ $$

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