$x+29=4$
$\frac{cos^2\left(u\right)}{sen\left(u\right)-1}$
$\lim\:_{x\to\:-1}\frac{\left(x^3-4x^2+x-6\right)}{x+1}$
$-2\:+4\:-6\:-5\:+2$
$9u+4u$
$\lim_{x\to+\infty}\left(\frac{\sin\:\left(\frac{1}{x^2}\right)}{e^{\frac{1}{x^2}}-1}\right)$
$x^2+14x+28$
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