$\int\left(2x+1\right)^3e^{-x}dx$
$\frac{3x^2+2x^2-1}{4x}$
$-2-1\cdot1^{3}$
$-56\:\cdot\:-90$
$y=\frac{1}{x}sin\left(x\right)$
$13+6t\ge1$
$84.5\cdot2$
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