$6x^2+50y-600$
$\lim_{x\to0}\left(\frac{e^{ax}-1}{\sqrt{x}\sqrt{e}}\right)$
$b^2\:4b+4$
$s^2+22s+122$
$\left(-4x+5\right)\left(-6x+7\right)$
$\cos a=\sin a$
$\frac{8+12}{4}-\frac{9+15}{8}$
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