$\frac{dy}{dx}=-\frac{2}{3}cos\:8x\:-\frac{4}{3}sen8x$
$y'=\:x^2\:+5x^2y$
$\frac{dy}{dx}=\left(y-5\right)^2e^x$
$\lim_{x\to\infty}\left(\frac{x\cdot e^x}{x+e^x}\right)$
$85\cdot39$
$\left(2x-1\right)\left(2x+1\right)$
$26+\left(-227\right)$
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