$x^2-5x+50=0$
$\frac{\cos2x-\cos^2x}{\cos x+1}=1\cos x$
$\frac{2x+1}{x^2-7x+6}$
$\int\left(4x\arcsin\left(x^2\right)\right)dx$
$\lim_{x\to0}\left(\frac{xe^{-\left|x\right|}}{\left|x\right|}\right)$
$\left(7ab^3+8\right)\left(7ab^3+3\right)$
$6:1$
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