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D( x )
81*x^(1/3) < 0
81*x^(1/3) < 0
81*x^(1/3) < 0
81*x^(1/3) < 0
81*x^(1/3) < 0 // : 81
x^(1/3) < 0/81
x^(1/3) < 0
x >= 0
x belongs to the empty set
x in (-oo:+oo)
(81*x^(1/3))^(5/4) = 0
243*x^(5/12) = 0 // : 243
x^(5/12) = 0
x = 0
x = 0
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