$\left(8.2\right)\left(-1\right)$

$x^2+\:20\:=\:2x$

$44\cos\left(17x\right)-22-44\cos\left(17x\right)\tan\left(x\right)+22\tan\left(x\right)=0$

$\int\:\frac{y+3}{\left(3-y\right)^{\frac{2}{3}}}dy$

$\int\frac{\cos x}{1-\cos^2x}dx$

$\lim_{x\to2}\left(\frac{2x^3-8x}{x^3-x^2-4x+4}\right)$

$-2x^2+4$