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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)
Y-(864/(x^2)) = 0
Y-864*x^-2 = 0
-864*x^-2 = -Y // : -864
x^-2 = Y/864
-2 < 0
1/(x^2) = Y/864 // * x^2
1 = (Y/864)*x^2 // : Y/864
864*Y^-1 = x^2
x^2 = 864*Y^-1 // ^ 1/2
abs(x) = 12*6^(1/2)*Y^(-1/2)
x = 12*6^(1/2)*Y^(-1/2) or x = -(12*6^(1/2)*Y^(-1/2))
x in { 12*6^(1/2)*Y^(-1/2), -(12*6^(1/2)*Y^(-1/2)) }
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