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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 = 5/(x^2)-36 // - 5/(x^2)-36
y-(5/(x^2))+36 = 0
y-5*x^-2+36 = 0
-5*x^-2 = -(y+36) // : -5
x^-2 = (y+36)/5
-2 < 0
1/(x^2) = (y+36)/5 // * x^2
1 = x^2*((y+36)/5) // : (y+36)/5
5*(y+36)^-1 = x^2
x^2 = 5*(y+36)^-1 // ^ 1/2
abs(x) = 5^(1/2)*(y+36)^(-1/2)
x = 5^(1/2)*(y+36)^(-1/2) or x = -(5^(1/2)*(y+36)^(-1/2))
x in { 5^(1/2)*(y+36)^(-1/2), -(5^(1/2)*(y+36)^(-1/2)) }
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