$\:dx+e^3x\:dy=0$
$\frac{\cos^{2}\left(-x\right)}{\cot^{2}x}$
$\left(x+\frac{1}{2}\right)\left(x-\frac{1}{2}\right)$
$53\left(15\right)$
$3\sqrt{c}-1\sqrt{c}+1$
$45a^2+81b^2$
$2+-19$
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