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D( x )
2*x < 0
2*x = 0
2*x < 0
2*x < 0
2*x+0 < 0 // - 0
2*x < 0 // : 2
x < 0/2
x < 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (0:+oo)
(2*x)^(-3/8) = 0
2^(-3/8)*x^(-3/8) = 0 // : 2^(-3/8)
x^(-3/8) = 0
x należy do O
x belongs to the empty set
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