$sen^2\:+\:\frac{-28}{53}=1$

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

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

$\frac{1}{4}ln\left(\frac{x-2}{2}+1\right)-ln\left(\frac{x-2}{2}-1\right)$

$\int\left(2-7x+2x^2-4x^3\right)dx$

$-2\left(x-20\right)$

$a=\left(3x+5\right)^2$