$\frac{27x^3-27x^2+9x-4}{3x-1}$

$9\left(2x+9\right)$

$\lim\:_{x\to\:\:-\infty\:\:}\left(2\sqrt{x^2-3x}\right)$

$\frac{3}{5}\log\left(x+y\right)-\frac{6}{5}\log\left(x-y\right)-2+3\log\left(x+y\right)$

$\frac{-4500}{36}$

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

$7+5inx=2$