$7a-4b+5\:-7a+4a-6c$
$-\left(-5\right)-\left(-12\right)$
$\left(x-6i\right)\left(x+6i\right)$
$\frac{\sin^2x}{1-\cos^2\left(x\right)}=1+\cos x$
$16+24h$
$\lim_{x\to\infty}\left(\left(x+1\right)^x\right)$
$+9+10-11-1+7$
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