$\left(\frac{1}{3}m+\frac{1}{6}n\right)\left(\frac{1}{3}m+\frac{1}{4}n\right)$

$\left(x+10\right)\left(x+20\right)$

$13\frac{7}{8}\:\sqrt{170}\:\frac{64}{5}\:13.5$

$\frac{\left(6x^3+27x^2+12x\right)}{\left(x-2\right)}$

$12^4-9a^3b^2+3a$

$\frac{1}{\cos\left(x\right)\left(1+\frac{\sin\left(x\right)^2}{\cos\left(x\right)^2}\right)}$

$\int\frac{\left(x^4+1\right)^3}{x^3}dx$