$\cos\left(2x\right)-11\cos\left(x\right)+6=0$
$\lim_{x\to0}\frac{\sqrt{x+1}-1}{\sqrt{x+4}-2}$
$\int\frac{6}{x^2-2x+2}dx$
$\frac{16x^6-144}{4x^3-12}$
$\frac{dx}{dt}=-3\cdot t^2\cdot x$
$4n^2-49$
$\left(a^1\right)^2$
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