$y^2-ay$
$\frac{st^8}{rt^4}^2$
$\lim_{x\to0}\sin\left(x\right)\left(\cot\left(x\right)\right)$
$\cot^2\left(1+\tan^2\right)$
$25x^7-10x^5+15x^2$
$\int\frac{\sqrt{x^2-81}}{x^2}dx$
$-54+2$
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