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D( x )
(3*a^2*c)^3 = 0
(3*a^2*c)^3 = 0
(3*a^2*c)^3 = 0
27*a^6*c^3 = 0
x należy do R
x belongs to the empty set
(-18*a^6*c^10)/((3*a^2*c)^3) = 0
x belongs to the empty set
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