$-8tan\left(x\right)-8=0$

$\lim\:_{x\to\:\:0}\left(\frac{sin\left(2x\right)}{\sqrt{1-cos\left(x\right)^2}}\right)$

$\left(6x^2+5x+6\right)$

$2a+7+9$

$\frac{m^2-25}{m-5}$

$\left(ax+by\right)\left(2by-2a\right)$

$-\:2\:\left[\:6\:\:+\:\left(\:\:5\:-\:3\:\right)\:\:+\:4\:-\:2\:-\:\:\left(\:-\:1\:-\:6\:\right)\:\right]\:-\:3\:$