$\left(xy+1\right)^2-\left(x+y\right)^2$

$\frac{1}{\cos\left(x\right)+1}\frac{1}{\cos\left(x\right)-1}=-2\csc\left(x\right)\cot\left(x\right)$

$\left(-7s-1\right)\left(6s+6\right)$

$\left(1+x\right)dy-ydx=0\:;\:y\left(1\right)=0$

$0.2342-0.3250$

$\lim_{x\to\infty}\left(\frac{8n^2+3n+2}{n^3+2n^4}\right)$

$\frac{d^4}{dx^4},\:x$