$cos\:=-\frac{4}{5}$
$\:f\left(x\right)\:=\:2\:x\:2+1\:\:\:\left[2,12\right]$
$\lim_{x\to-4}\left(3x^6-2x^5+x^3-x-20\right)$
$\int\frac{x^2+1}{x\sqrt{x^2-4}}dx$
$x9\:\cdot\:x-7$
$v^2+8v=15$
$7\cdot\left(10\right)+7\cdot\left(17\right)$
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