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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
0 = 2*x^(-3/4) // - 2*x^(-3/4)
0-(2*x^(-3/4)) = 0
-2*x^(-3/4) = 0
-2*x^(-3/4) = 0 // : -2
x^(-3/4) = 0
x należy do O
x belongs to the empty set
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