$\log_b\left(\frac{1}{n}\right)$

$\left(4x+4y\right)^2$

$y=\left(3x+1\right)^5\left(8x^2+2\right)^6$

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

$\lim_{x\to1}\left(\frac{2x-4}{\left(x^2-4x+4\right)\cos\left(x-2\right)}\right)$

$\frac{2\cos\left(x\right)-\sec\left(x\right)}{2\sin\left(x\right)}=\cot2x$

$\lim_{x\to\infty}\left(x-1\right)$