$9x^2-6x+8$
$3^{2-2}$
$\left(\frac{6^9}{6^8}\right)^2$
$cos^2\:x\:+\:2sen^2\:x\:-\:sen\:x\:=\:\frac{3}{4}$
$\left(3^2\right)^2-\left(-4\right)^2$
$f\left(x\right)=\frac{6}{1-x^5}$
$\lim_{x\to\infty}t\:\sin\left(\frac{1}{t}\right)$
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