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D( x )
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0
3*x^2 = 0 // : 3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
-((((3*x^2)^-3)/6)*x^4) = 0
-1/162*x^-2 = 0 // : -1/162
x^-2 = 0
x należy do O
x belongs to the empty set
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