$\frac{x^3-4x^2+9x+18}{x+2}$
$\lim_{x\to\infty}\left(\frac{3^x-1}{1+5^n}\right)$
$\left(2\tan\:\left(x\right)\:-\:sen\left(x\right)\right)\left(2\tan\left(x\right)\:+\:sen\left(x\right)\right)$
$3a^2-3$
$\sqrt[3]{18:\:\left(-3\right)-2}+\left(-5^2+7^0\right):\:4$
$3y^2-11y+10=0$
$2x^2+6\le0$
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