$36+121c^2132c$
$216.6^x=6^{-5}$
$6^3-a^2+2b-1$
$\lim\:_{x\to\:0}\left(\frac{sin\left(x^2+2x\right)}{x}\right)$
$\sec\left(x+30\right)=2.5$
$38,9-2,6$
$2\:+7$
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