$\left(y-1\right)^4$
$\left(\sqrt{13}+2\right)\left(\sqrt{13}-2\right)$
$25x^6-30x^3+9$
$5x^2-45x+20=0$
$\int\frac{2}{t^4}dx$
$\frac{2x^4-2x^3-4x^2+7}{x+2}$
$\int-x\cdot\cos\left(nx\right)dx$
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