$6a^2b+4ab$
$n=\frac{\left[\left(x+2y\right)^2-x^2-4y^2\right]}{xy}$
$3-\left(5-8\right)-\left(11-4\right)+\left(13-9\right)$
$x+1+2x+2\:3x-3$
$\int\left(15x^2\sqrt{x^3+6}\right)dx$
$\frac{x^2-x+2}{x^2}$
$6h\:+\:4\:+\:7h\:$
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