$\frac{sen\:x+cot\:x}{tg\:x+cosec\:x}=cos$
$\lim_{x\to\infty}\left(\frac{9x^2}{x^2+1}\right)$
$\left(x^2-3\right)\cdot\left(x^2+3\right)$
$\frac{x^n}{2^n}$
$4f+4f+4g$
$1x^2+9x+1c$
$17\left(u+4\right)$
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