$\left(3y\:\sin\left(2x\right)\right)dx-dy=0$

$\int\frac{x^5}{x^2+2}dx$

$\int\:\frac{3x-5}{x^2-25}dx$

$\left(\frac{1}{5}+\frac{1}{4}\right)^2$

$ln\left(7x+1\right)-ln\left(2x+5\right)$

$4^4-2x^3-21x^2+22x+40$

$\frac{1-\cos4\left(x\right)}{\sin4\left(x\right)}=\tan2\left(x\right)$