- 2xyy'+x^2+y^2=0 Help needed with solving this DE?

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What is the physics of electricity? Please help. 3x^3-x^2-5x+7=0(mod 11),
find all possible x.? Why is it that lightbulbs have to be replaced, but the light sources in televisions and laptop screens never need replacing? Find all solutions of the equation in the interval [0, 2π) 10 cos2 x + 5 cos x − 5 = 0? Is space the cause of mass volume to curve or is it mass that cause space to curve?