$2\sin\frac{5\pi}{3}\cot\frac{3\pi}{4}\sec\frac{11\pi}{6}$

$ln\left(x^2-9\right)\:-\:ln\left(x-3\right)$

$\int\:15x\:\sqrt{x+1}\:dx$

$\left(28m^2-13m-6\right)\left(4m-4\right)$

$\frac{x^7}{x^{14}}$

$25x^2-100x-100=0$

$\lim_{x\to\infty}\left(\frac{ln\left(1+\frac{9}{x}\right)}{\frac{1}{x}}\right)$