$-\left(3x-\left(2x+y\right)+2\cdot\left(-3x-3y\right)\right)$
$\left(x^2+9\right)\left(\sqrt{x+8}\right)\left(8\right)$
$\int te^{2t}dx$
$x^2+3x+3$
$20-\left|-30\right|$
$\int\left(\frac{sec^2\left(lnx^2\right)}{2x}\right)dx$
$cot\:x.\:cos\:x.\:sen\:x=sen^2$
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