$-2x^4+10x-3x.x-3$
$n^4+10n^2w+25w^2$
$\sqrt{\frac{25-x^2}{x}}$
$\int\frac{x^2}{-1\left(1+x^2\right)}dx$
$3.1416\cdot3.5^2$
$\left(\frac{1}{4}+ab\right)^2$
$\left(a+4b\right)\left(-4b+3a\right)$
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