$3r\:\ge\:27$

$\left(x+1\right)^2-\left(x-1\right)^2-2$

$\lim_{x\to2}\left(\frac{\left(x^2+4x-12\right)}{x-2}\right)$

$-7x\ge-56$

$\lim_{t\to0}\left(\frac{ln\left(sin\left(3t\right)\right)}{ln\left(tan\left(2t\right)\right)}\right)$

$x^2+18x+16$

$\int\left(\frac{1}{\sqrt{x}\left(5+\sqrt{x}\right)^5}\right)dx$