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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)
2-(3600/(x^2)) = 0
2-3600*x^-2 = 0
-3600*x^-2 = -2 // : -3600
x^-2 = 1/1800
-2 < 0
1/(x^2) = 1/1800 // * x^2
1 = 1/1800*x^2 // : 1/1800
1800 = x^2
x^2 = 1800 // ^ 1/2
abs(x) = 30*2^(1/2)
x = 30*2^(1/2) or x = -(30*2^(1/2))
x in { 30*2^(1/2), -(30*2^(1/2)) }
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