$\lim_{x\to infinity}\left(\frac{e^{-x^3}}{x^2}\right)$
$f^4-2f^2+1$
$50-\left(-30\right)$
$\left(7x+2y-4\right)+\left(9y-6z+5\right)$
$\left(4x^4\right)^2$
$\left(8y^2\right)\left(\frac{1}{6}y^{12}\right)^{-1}$
$\frac{x^4-2x^2+1}{x-1}$
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