$y^5-81y$
$\lim_{x\to\frac{x}{2}}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$\frac{\tan\left(x\right)}{\cos\left(x+1\right)}$
$\left(\frac{a^3}{64}-\frac{b^3}{343}\right)$
$\int\frac{x^2}{\left(4x+1\right)^{\frac{5}{2}}}dx$
$\left(5\right)+\left(-7\right)\cdot\left(-3\right)+\left(-2\right)\cdot\left(-5\right)$
$\lim_{x\to0}\left(\frac{tan\:x}{x\:sec\:x}\right)$
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