$2\left(3^2\right)-3$

$2ab+4b-10ab-40bc$

$\left(2-4+1\right)\sqrt{2}$

$a^{2+5}.a^{2+5+8}\:a^{2+5+8}.a^{2+5+8}.a^{2+5+8}$

$\int\left(\frac{9x+4}{\left(9x^2+8x\right)^5}\right)dx$

$\lim_{x\to\infty}\frac{6f^3-4f^2+7f-8}{2+6f-f^2+3f^3}$

$\left(\tan\left(y\right)+\frac{1}{\tan\left(y\right)}\right)\left(1-\cos\left(y\right)^2\right)$