$\int-2xe^{4x}dx$
$3x^2-60x$
$9e-7=7e-11$
$\frac{d^2}{dx^2}\left(2xe^{-x}\right)$
$-10x=-30$
$\left(\frac{3\sqrt{11}}{11}\right)^2+\cos^2\left(x\right)=1$
$2\sqrt{25}$
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