Answer
$y^{2}$=C-8cosx
Work Step by Step
yy'=4sinx
$y\frac{dy}{dx}$+4sinx
$\int$ydy+$\int$4sinxdx
$\frac{y^{2}}{2}$=-4cosx+$C_{1}$
$y^{2}$=$C_1-8$cosx
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