$\frac{x^2}{4}+4y^2$
$\frac{d}{dx}\frac{3x^4+7}{x^2}$
$\left(8x^3y^2\right)\left(-5b\right)$
$3x^2+2x-8x-2$
$6b+6b^2+4b^3$
$x^2+4x+20$
$43+51+65-94+12-86$
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