$\left(2\cdot x\cdot y-e^{2y}\right)\cdot dx+\left(x^2-2\cdot x\cdot e^{2y}-y\right)\cdot dy=0$

$\int\frac{5x+3}{x^2-9}dx$

$a^2\:x-y\:-\:x-y$

$13+4-\left(5-7\right)+6$

$12x^2y+16xz+24xm$

$\int\sqrt[2]{4-9x^2}dx$

$\lim_{x\to3}\left(\frac{4x}{9ln\left(1+2e^x\right)}\right)$