$20x^2-7x-6=0$
$\lim_{x\to\infty}\left(x^2-1\right)^{\frac{1}{x}}$
$a^2+4^2+4ab-x^2-2ax-a^2$
$416,7\:-\:392,18$
$\left(5-8x\right)^2$
$\left(x+2\right)+\left(x^4+2x+6\right)$
$\left(1+\tan^2\left(b\right)\right)\left(\cos^2\left(b\right)\right)$
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