$\lim_{x\to4}\left(\frac{x-5}{x^2-16}\right)$
$-x-20=2x+1$
$\int\frac{\sin\left(x\right)\cos^2\left(x\right)}{5+\cos^2\left(x\right)}dx$
$6\:+\:2x\:\:\ge\:\:x\:-\:3$
$\left(a-\sqrt{b}\right)^4+\left(a+\sqrt{b}\right)^4$
$\int ze^{3x}dx$
$9a^2b^3+7a^2b^3-15b^3a^2$
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