$2\:sen2\left(a\right)+\:sen\left(a\right)=0$

$361^2m+241m^2n$

$5-4x+2x^2+7-x$

$\frac{d}{dx}\left(x-3xy+2y\right)=0$

$tan^4\left(x\right)+sec^2\left(x\right)+tan^2\left(x\right)-sec^4\left(x\right)=0$

$\int sec62\left(x\right)dx$

$\frac{\tan\left(w\right)}{1-\left(\tan\left(w\right)\right)^2}$