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D( x )
x < 0
x^(1/4) <= 0
x < 0
x^(1/4) <= 0
x^(1/4) <= 0
1*x^(1/4) <= 0
1*x^(1/4) <= 0 // : 1
x^(1/4) <= 0/1
x^(1/4) <= 0
x >= 0
x in <0:0>
x in (0:+oo)
ln(x^(1/4)) = 0
ln(x^(1/4)) = ln(e^0)
x^(1/4) = e^0
x^(1/4)-e^0 = 0
1*x^(1/4) = 1 // : 1
x^(1/4) = 1
x^(1/4) = 1 // ^ 4
x = 1
x = 1
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