$\left(4st+5s^2t^3-st^3\right)\left(-5st+4s^2t-7st^3\right)$
$x^2-z^2+3x+2z+4=y$
$\frac{\left(3a^kb^{4k}\right)^3}{\left(5a^{k+1}b^{2k-1}\right)^2}$
$2a+7+9$
$\left(5p-1\right)\left(5p+3\right)$
$\lim_{t\to1}\:cot\left(\pi t\right)$
$2x^3+4x^4+8x^2$
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