$\left(4-\sqrt{8}\right)\left(\sqrt{8}+4\right)$
$120\cdot0$
$\sin^{4}\theta+\sin^{2}\theta\cos^{2}\theta$
$\frac{x^4-2x^3-x^2+2x}{x^2-x}=0$
$2^2+3y+4$
$-\frac{2x-4}{\left(x-4\right)^4}$
$4a^2b+12ab$
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