$cos\frac{1}{2}x=-\frac{\sqrt{3}}{2}$
$x^{-4}y\int\left(xe^x\right)dx$
$x1\:\left(\frac{\sqrt{15}}{4}\right)\:sen\:\:\left(\frac{\sqrt{15}}{4}\left(0\right)\right)$
$\frac{d}{dx}\left(x^x\right)y=\:e^{sinx}\:sinx$
$5a-\left(6a-2a\right)$
$3x^2-30x+0$
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