$\lim_{x\to0}\left(\frac{x^4}{e^{3x}}\right)$
$\left(4x^4-y^2\right)^2$
$16a+24b\:$
$8x^4+20x^3-12x^2$
$x-13=20$
$6x^2+y^2=9$
$\frac{-10y^8-20y^3}{10}$
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