$\frac{1}{3}x-\frac{4}{6}$
$a^6b^6-b^6a^2$
$40y^{-1}y=5$
$\frac{tgx+\frac{1}{cosx}.cscx}{tgx+\frac{1}{cosx}.cscx}$
$\ln\left(x^2-6x+9\right)$
$\frac{tan\left(cscx+cos\right)}{sec+sen}$
$3\sec^23x-3=3\tan^23x$
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