$de\:20\:-\:\left(-\:5\:\right)\:$
$3-x=0$
$\int_1^eln\:\left(x\right)dx$
$\int_1^2\frac{1}{x\left(\ln\left(x\right)\right)^3}dx$
$512+27k^9$
$2\:sec\:x\:tg\:3x-2secx+tg\:3x-1=0$
$\int\left(\sqrt{xy}\right)dx$
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