$tana-\:sena\left\{\right\}$
$\lim_{x\to\infty}\left(\frac{x-\sin\left(x\right)}{x-\tan\left(x\right)}\right)$
$\int\frac{5}{\left(3x+1\right)\left(1+\ln\:\left(3x+1\right)\right)^2}dx$
$\int z^2sen\left(4z\right)dz$
$x^2-2x-24=0$
$-\:4\:-\:2\:\left(\:9\:-\:5\:d\:\right)\:+\:3\:d\:+\:12\:$
$\frac{x^3+2x^2+4x+1}{x^2+1}$
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