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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
3*5*x^(-2/3)*x^(1/2) = 0
15*x^(-1/6) = 0 // : 15
x^(-1/6) = 0
x należy do O
x belongs to the empty set
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