$\frac{252}{-21}$
$\cos\left(x\right)\sec\left(x\right)-\sin^2\left(x\right)$
$2^2xy3$
$9\cdot\left(-78\right)$
$\left(-8\right)+5-\left(-7\right)+4+1\left(-2\right)$
$\lim_{x\to\infty}\left(\sqrt{x\left(x+2\:\right)}\:-x\:\right)$
$\left(\tan\left(x\right)+\sqrt{3}\right)\left(2\sin\left(x\right)-\sqrt{2}\right)=0$
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