$\int6x^4e^{-x}dx$
$\left|-9\right|+\left|8\right|$
$-120+3\left(4-5\right)+8-12\:\left(7-3\right)$
$ctg^2\:x+1$
$\left(2+x^2\right)\left(4+x^6\right)$
$1-6y+12y-8y^{3}$
$x^2+2xy^2-y^2=9$
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