$8xy-17xy+6xy-4xy$
$\left(-5xy^2z\right)\left(3x+4y-2\right)$
$\lim\:_{x\to\:0}\left(\frac{tan^2x}{xsinx}\right)$
$3x^2+2x-5\:si\:x=-2$
$\int\left(tan^6xsec^6x\right)dx$
$2x-3<x-1$
$0,42+0,040+0,75+0,073$
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