$x^2-5x-5$
$\left(7a-9b+3c\right)^2$
$\lim_{x\to-\infty}\left(x-2\right)$
$tana=-\frac{2}{\sqrt{5}}$
$\int\frac{1}{x^2\sqrt{144+x^2}}dx$
$48\cdot\left(-50\right)$
$b+b$
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