$\int_0^{\infty}\left(\frac{x^2-1}{1+x^2}\right)dx$

$csc\left(2\right)j\:+\:cot\left(2\right)j$

$\frac{2x^3-6x^2+x-1}{2x^2+1}$

$\frac{d}{dx}\left(y\right)x=\left(y+1\right)^2$

$\left(5x+8y\right)\left(8x-5y\right)$

$\lim_{x\to2}\left(\frac{4-x^2}{x-\sqrt{x^2+5}}\right)$

$\frac{d}{dx}\left(\left(y-5\right)^5=x^2+2xy-34\right)$