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D( x )
x < 0
x^0.75 = 0
x < 0
x^0.75 = 0
x^0.75 = 0
1*x^0.75 = 0 // : 1
x^0.75 = 0
x = 0
x in (0:+oo)
15/(x^0.75) = 0
15*x^-0.75 = 0 // : 15
x^-0.75 = 0
x należy do O
x belongs to the empty set
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