$\int\left(8x^3+6x^2+2x-5\right)e^{4x}dx$
$4x^2-48x+144$
$x-20=-5\left(x-8\right)$
$cos\left(tan^{-1}\left(3x\right)\right)$
$-2448+\left(-2448\right)$
$1x^2+0x+25=0$
$cos\:y\:dx+\left(1+e^{-x}\right)sen\:y\:dy=0$
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