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D( x )
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (50*x^4)/(2*x^2) // - (50*x^4)/(2*x^2)
y-((50*x^4)/(2*x^2)) = 0
y-25*x^2 = 0
-25*x^2 = -y // : -25
x^2 = y/25
x^2 = y/25 // ^ 1/2
abs(x) = (y^(1/2))/5
x = (y^(1/2))/5 or x = -((y^(1/2))/5)
x in { (y^(1/2))/5, -((y^(1/2))/5) }
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