$-\int\frac{x^2+2x+5}{\left(x-2\right)\left(x+2\right)\left(x-1\right)}dx$

$\int\cos^2\frac{x}{3}dx$

$\log_{17}\left(n^2+53\right)=\log_{17}\left(15n-3\right)$

$\lim_{x\to e}\left(\frac{x-e}{1-e^{x-e}}\right)$

$24+2\left(-4+10\right)$

$\left(\frac{2}{3}+2k\right)\left(\frac{2}{3}-2k\right)$

$\int\frac{3x}{\left(x+9\right)\left(x-7\right)}dx$