$\lim_{x\to\infty}\left(\frac{x^x}{e^{4x}}\right)$
$\left(3x^2-5y^3\right)^4$
$\left(2x^2y^2-\frac{1}{5}wz\right)$
$4y^{2}-3y+9y^{4}+7y-5y^{2}$
$43+51+65-94+12-86$
$\left(4a+1\right)\left(4a-4\right)$
$\lim_{h\to0}\frac{\left(x-h\right)^2-x^2}{h}$
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