$\frac{1}{sinx}-sinx$
$\lim_{x\to8}\left(\frac{8-x}{2-\sqrt[3]{x}}\right)$
$\left(\frac{3}{7}+y^2\right)\left(\frac{3}{7}-y^2\right)$
$5x^2y\:.\:2xy^2$
$6\left(4x+9\right)-8\left(5x-8\right)$
$\int\frac{x^{2}}{\sqrt{1-x}}dx$
$\left(\frac{a^5b^4c^{-7}}{b^5c^{-7}}\right)$
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