$\:18\::\:2\::\:3\:$

$\int_0^{\pi}\left(\frac{1}{5-3\cos\left(x\right)}\right)dx$

$\left(9x^2\:+\:\frac{1}{2}y^4\right)^2$

$\lim_{x\to\infty}\left(\frac{\tan\left(x^2\right)+e^{x^2}-\cos\left(x\right)}{x^2}\right)$

$\int_1^4\left(-4x\right)dx$

$\int\left(\left(2x-9\right)^{-4}\right)dx$

$5\cdot4-2-4:\:2$