$\lim_{x\to\infty}\left(\frac{3x}{x-1}-\frac{2x}{x+1}\right)$
$\left(8ab^2c^3\right)^2$
$36x^2+105x-50=0$
$cos\left(sen^1\left(x\right)\right)$
$1.3x\:-\:7y\:+\:5x\:+\:4y\:$
$ln\left(x^2+1\right)=3$
$2y^2+5y+2$
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