$\int\left(csc^2\left(1+2x\right)\right)dx$

$\sqrt{2}+3\sqrt{2}+5\sqrt{2}$

$-3x+2;x=3$

$cy+cx$

$\lim_{x\to-2}\left(\frac{x^4+5x+6}{x^4+5x-6}\right)$

$\lim_{x\to2}\left(\frac{\cos\left(x\right)-\cos\left(\sin\left(2x\right)\right)}{x^2}\right)$

$\ln\:\left(x^3-2x+1\right)-2\ln\:\left(3x-1\right)$