$a\left(18a^4-32\right)$

$\int\:\frac{1}{x^2+1}dx$

$\frac{x^2+27}{3+x}$

$\left(2a^2-3b^2\right)^4$

$\frac{1}{2}\int\frac{\sqrt{1-x^2}}{x+1}dx$

$\left(4x^2-81w^4\right)$

$\lim_{x\to\infty}\left(\frac{\frac{2^x+1}{2^x}}{\frac{2^x}{2^x}}\right)^{\lim_{x\to\infty\:}\left(2^x+1\right)}$