$\int_9^{\infty}\left(\frac{x}{\sqrt{1+x^2}}\right)dx$

$\int_0^{\frac{\pi}{2}}\left(3sen^2\cdot cost\cdot i\right)dx$

$\lim_{x\to\infty}\left(\csc\left(x\right)\right)$

$\sqrt{am}$

$\left(2xy+3y-2x-3\right)dx=\left(3xy-3y-4x+4\right)dx$

$\frac{x^2}{2}-xy+y^2$

$j^2+8j+16$