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

$+1326\:-\:+7891\:+\:-6777$

$\lim_{x\to1}\frac{\left(x-1\right)^5}{x^5-1}$

$\left(3x+\frac{2}{x}\right)^4$

$\frac{1-\cos^2x}{\sec^2x-1}$

$\frac{d}{dx}\left(\sqrt{\frac{\left(x-2\right)^3}{x^2+1}}\right)$

$\lim_{x\to\infty}\left(\frac{sinx\:\cdot\:x}{x^3+2x^2-x+1}\right)$