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D( x )
9*x^6 = 0
10*x^3 = 0
9*x^2 = 0
9*x^6 = 0
9*x^6 = 0
9*x^6 = 0 // : 9
x^6 = 0
x = 0
10*x^3 = 0
10*x^3 = 0
10*x^3 = 0 // : 10
x^3 = 0
x = 0
9*x^2 = 0
9*x^2 = 0
9*x^2 = 0 // : 9
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((81*x^5)/(9*x^2))/(9*x^6))/(10*x^3) = 0
1/10*x^-6 = 0 // : 1/10
x^-6 = 0
x należy do O
x belongs to the empty set
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