$\lim_{x,y\to0,0}\left(\frac{x^2-y^2}{\left(x+y\right)^2}\right)$

$+\:3\:-\:5\:+\:2\:-\:10\:+\:4\:-\:7\:+\:1$

$\frac{1}{2}x-\frac{3}{10}-\frac{11}{2}y-\frac{1}{4}x-\frac{3}{6}y+\frac{2}{10}m-\frac{1}{5}m$

$3\:.\:\log5\:x\:=\:3$

$\int\frac{8x}{\left(x^2+3\right)\left(x-1\right)^2}dx$

$3c-d^2+2d^2x-6cx$

$\frac{dy}{dx}=\frac{1}{1-x^2}$