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D( x )
15*x^2 = 0
m^4 = 0
15*x^2 = 0
15*x^2 = 0
15*x^2 = 0 // : 15
x^2 = 0
x = 0
m^4 = 0
m^4 = 0
m^4 = 0
x należy do R
x belongs to the empty set
(((6*x^3)/(m^4))*m^3)/(15*x^2) = 0
x belongs to the empty set
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