$yx^{-4}-4x^4-yx^{-4}$
$\lim_{x\to\infty}\left(1+e^{-x}\right)^{e^x}$
$x^7+x^3$
$\left(-33y^4x^3+24y^5x^7-20yx^2\right)\left(-4y^4x^3\right)$
$\sqrt{3}tan^2\:a-3\:\tan a=0$
$\frac{3m^{10}n^{10}}{15m^6n^4}$
$\int\frac{\left(s+4\right)}{2s+3}ds$
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