$\left(\frac{ab}{3}-\frac{c}{2}\right)^2$
$\frac{1}{cosx}\left(\frac{1}{cosx}+se\right)$
$\lim_{x\to0\:}\left(1-\tan\left(2x\right)^{\frac{4}{x}}\right)$
$\frac{dy}{dx}\left(x^2+1\right)=y$
$\left(5\right)\cdot\left(-4\right)\cdot\left(0\right)\cdot\left(-2\right)$
$\lim_{x\to1}\left(\frac{\left(x-1\right)\left(x+1\right)}{x-1}\right)$
$15^2+6^2$
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