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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)
10 = 1.5/(x^2) // - 1.5/(x^2)
10-(1.5/(x^2)) = 0
10-1.5*x^-2 = 0
-1.5*x^-2 = -10 // : -1.5
x^-2 = 6.66666667
-2 < 0
1/(x^2) = 6.66666667 // * x^2
1 = 6.66666667*x^2 // : 6.66666667
0.15 = x^2
x^2 = 0.15 // ^ 1/2
abs(x) = 0.15^(1/2)
x = 0.15^(1/2) or x = -0.15^(1/2)
x in { 0.15^(1/2), -0.15^(1/2) }
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