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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
15 = 10/(x^2) // - 10/(x^2)
15-(10/(x^2)) = 0
15-10*x^-2 = 0
-10*x^-2 = -15 // : -10
x^-2 = 3/2
-2 < 0
1/(x^2) = 3/2 // * x^2
1 = 3/2*x^2 // : 3/2
2/3 = x^2
x^2 = 2/3 // ^ 1/2
abs(x) = (2/3)^(1/2)
x = (2/3)^(1/2) or x = -(2/3)^(1/2)
x in { (2/3)^(1/2), -(2/3)^(1/2) }
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