$10cos^2x+13cosx+4=0$
$x^2\:-\:20x\:+\:x^2\:+\:3x\:$
$\int\frac{9}{\left(x+1\right)^2}dx$
$\frac{x^4+2x^2+1}{x+1}$
$5x^4+10x^2-15x^3$
$\frac{x}{2}=-6$
$3x^2-2x+8$
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