$\frac{z}{7}-6\ge-5$
$\left(ax\:+\:l\:-2bx\:-\:1\right)\left(ax\:+\:l\:+\:2bx\:-\:1\:\right)\:$
$-21\:-\:\left[\left(-19\right)\:+\:31\:-\:29\:-\:\left(-12\right)\right]$
$\left(6^2\cdot7^3\right)^5$
$\lim_{x\to\frac{\pi}{2}}\left(1+2cosx\right)^{secx}$
$\lim_{x\to2}\left(\sqrt{x+2}-2\right)$
$\left(\sqrt{2}\right)^x=2^{x+1}$
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