$2x^2-6x-8=0$

$\frac{cos\left(a\right)}{1+sin\left(a\right)}-\frac{\cos\left(a\right)}{1-\sin\left(a\right)}=-2\tan\left(a\right)$

$2m^0n^2\cdot3n^0$

$\sqrt{3x^7}+2x^3$

$\left(\frac{3}{7}\right)\:\left(\frac{2}{6}\right)\left(7\right)$

$\left(3x-5\right)\cdot\left(2x-1\right)$

$9n^2+6n^1m^1+m^2$