$2x+\frac{-6x+12}{x^2-4}$

$\left(2x\left(y+3\right)\right)\left(2x-1\right)$

$\frac{\tan\left(u\right)+\sec\left(u\right)\sin\left(u\right)}{\tan\left(u\right)}=2$

$\left(-\frac{1}{0}-\left(-\frac{1}{-\infty}\right)\right)$

$2sinxcosx=\left(sinx+cosx+1\right)\left(sinx+cosx-1\right)$

$-\sqrt{-96}$

$x^2+6x+28$