$x-x^3$
$\left(x^3+5\right)\left(x^3+2\right)$
$x^2-12x+20=0$
$\int\left(\frac{5}{a+bx}\right)dx$
$\tan^2a-\sin^2a$
$\frac{7}{6-3x}>8$
$- 3 x ^ { 2 } + 6 x + 1 = 0$
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