$t^2-36$
$8^{-9}\cdot8^{11}$
$\lim_{x\to\infty}\left(sen\left(\frac{2x^2-3x}{\sqrt{x}}\right)\right)$
$\sqrt{-49}\cdot\sqrt{-81}$
$9x^6y^4z+x^3y^6z^2$
$\sin\left(\frac{8}{17}\right)\cos\left(\frac{15}{17}\right)$
$2xy+7x^2y=xy^2$
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