$x^2+8x+-16$
$\lim_{x\to0}\left(\frac{1-\cos\left(9x\right)}{x}\right)$
$\frac{\left(\sec\:\:\left(x\right)-\tan\:\:\left(x\right)\right)^2+1}{\csc\left(x\right)\left(\sec\left(x\right)-\tan\left(x\right)\right)}=2\tan\left(x\right)$
$c^4+8c^216$
$\left(7\cdot\:6\right)^3$
$x^2+3x+7=0$
$2y\left(-3y-a\right)$
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