$\left(-66\right)\:+\:\left(-55\right)\:+\:\left(-44\right)\:+\:\left(250\right)$
$y=\:\frac{1}{3}x^3-\frac{1}{2}x^2$
$\int4.2sen^2\left(1.24\:+\:2x\right)dx$
$\frac{x+2}{\left(x^2+1\right)\left(x^2+2\right)}$
$4\cdot r+5<9$
$\int\frac{5}{\left(4-2x\right)^2}dx$
$\sqrt[3]{8a^6}b-3$
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