$9+10+10^2$
$-4\left(u+5\right)+2u$
$\frac{dy}{dx}=\frac{4x+xy}{y-x^2y}$
$a+b+2\:a+b\:-2$
$\frac{x+x^2}{3-5x^2}$
$3k^2\left(15k^3\right)$
$cos^2x=0.6$
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