$3\:cos\left(t\right)\:tan\left(t\right)$
$\left(-8x^3+6x^2-3x-2\right)-\left(10^3-12x^2+2x-1\right)$
$\lim_{x\to+\infty}\left(\frac{x^2-2x+5}{x\sqrt{x^2+1}}\right)$
$\int2\ln x^2dx$
$\frac{10}{8-x}+2=\frac{5}{8-x}+3$
$2x^2-8x-8$
$x^2-8x+7=0$
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