$\int e^{-x}\left(e^{3x}-e^x-1\right)dx$
$-\left(x+4\right)$
$( a ^ { 3 } + 7 ) ( a ^ { 3 } - 6 )$
$1+\cos\left(a\right)^2+2\sin\left(a\right)^2$
$\frac{dy}{dx}=-\frac{7y^2}{x^7}$
$- 1 - ( - 4 + 6 ) + 2 - ( - 1 - 2 )$
$\left(3a+2b+c\right)^2\left(a+4c-3b\right)^2$
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