$\left(s+9\right)\left(s+10\right)$
$33-\left(125+-\left(-80-33\right)+12\right)$
$-12+-53-\left(-20\right)-\left(-11\right)\cdot7$
$\left(2x\:+\:4y\:-\:7\right)\:\cdot\:\left(6x\right)$
$-15+\left(-2+5\right)-\left(-10\right)$
$\frac{\cos\left(u\right)}{\cos\left(u\right)-\sin\left(u\right)}=\frac{1}{1-\tan\left(u\right)}$
$\lim_{x\to\infty}\left(1+\frac{2}{x^3}\right)^x$
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