$r^2+14r+45$
$x+2x^3$
$3k<27$
$2\cos^2x+\cos\left(x-1\right)$
$\int\left(\frac{3-x^2}{-2x}\right)dx$
$\frac{7a^5b^6}{-21a^3b^4}$
$-3+47\cdot13$
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