$3\left[a-2\left(a+5\right)+6\left(a-1\right)\right]$
$\lim_{x\to\infty}\left(\frac{x\cos x-\senx}{x^{3}}\right)$
$x^2-10x+19=0$
$\left(x^2+x-4\right)^2$
$\left(-6\right)-\left(-5\right)-\left(-10\right)$
$-5\:-\:\left(-16\right)\:-\:8\:+\:17\:$
$25m^4-121f^{10}$
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