$3x^2-4x+2$
$x^2\:y^2\:-121c^2$
$\lim_{x\to\infty}\left(\frac{ln\left(x^2\right)}{12x}\right)$
$\lim_{x\to0}\left(\frac{3x^3}{9x-sen2x}\right)$
$8y-2y+5y$
$\left(tanx\right)^2=2.25$
$16-y^2$
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