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D( x )
12*x^3 = 0
12*x^3 = 0
12*x^3 = 0
12*x^3 = 0 // : 12
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(36*x^2*x^12-18)/(12*x^3) = 0
(36*x^14-18)/(12*x^3) = 0
36*x^14 = 18 // : 36
x^14 = 1/2
x^14 = 1/2 // ^ 1/14
abs(x) = (1/2)^(1/14)
x = (1/2)^(1/14) or x = -(1/2)^(1/14)
x in { (1/2)^(1/14), -(1/2)^(1/14) }
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