$\int_{\infty}^0\left(\pi e^{3t}\right)dx$
$\frac{3x+3}{x^2-8x-9}$
$\left(n^2+15\right)\left(n^2+13\right)$
$40\:-16+12+60-15$
$\left(x\frac{3}{5}-4y\frac{2}{3}\right)^2$
$9x^2+24xy+1by^2$
$xy^3-x^2y$
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