$2ab^2\:2a^2b$

$\frac{2x^2}{9}=18$

$\left(2x^2+7\right)^2$

$\cos\left(a\right).\frac{1}{\sin\left(a\right)}.\tan\left(a\right)$

$7x^5y^5\left(14x^4y^2\right)$

$\lim_{x\to0}\left(\frac{y\left(x-7\right)}{\left(x-7\right)^2+3y^2}\right)$

$\int\left(x^2-12x+36\right)dx$