$8x-16-7x-21$
$a^mxa^n$
$\lim_{x\to\infty}\left(\frac{2x+6}{7x^2+3x-4}\right)$
$\int\left(\frac{cos4x}{\sqrt{sen4x+3}}\right)dx$
$y=\sqrt{\frac{x-2}{x^6+5}}$
$-\frac{2}{3}yz-173yz-\frac{6}{3}yz$
$4x^2+6+2$
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