$9x\left(x-\frac{2}{x+2}\right)$
$4+4\log3y-\frac{\log3y}{4}$
$45.76\cdot0.25$
$\:\frac{\left(-49\right)}{7}\cdot\left(-1\right)$
$\frac{x+1}{6}+\frac{x-4}{3}>\frac{9}{4}$
$\frac{\cos\left(90^{\circ}-a\right)}{\sena}$
$\frac{dx}{dt}=\left(x-2\right)cot\left(t\right)$
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