$6n^{2}-2n-3+5n^{2}-4n-6$
$9x^2+18x$
$\left(\frac{3}{4}w+9z^2\right)^2$
$\left(4-\sqrt{16}\right)$
$\int_1^{\infty}\left(\frac{2}{x\left(x+15\right)}\right)dx$
$\frac{x\left(x^2-4\right)}{x\left(x-2\right)}$
$\int\left(\frac{9x^5}{\sqrt{1-x^3}}\right)dx$
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