$sec\left(x\right)+sin\left(-x\right)tan\left(x\right)$
$6^3\cdot2^3$
$\lim_{x\to\infty}\left(\frac{9x^{\:3}}{e^{8x}}\right)$
$\frac{dy}{dx}\left(y^2+xy^2\right)=1$
$3x+8\le x+20$
$u\:2\:-\:4u\:-\:60$
$\lim_{x\to4}-\frac{\sqrt{16-x^2}}{x-4}$
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