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D( x )
x = 0
1/x <= 0
x = 0
x = 0
1/x <= 0
1/x <= 0
1*x^-1 <= 0
1*x^-1 <= 0 // : 1
x^-1 <= 0/1
x^-1 <= 0
1/(x^1) <= 0
x <> 0
1/(x^1) <= 0 // * x^2
(x^2)/(x^1) <= 0
x^1 <= 0
x <= 0
x in (-oo:0)
x in (0:+oo)
4*ln(1/x) = 1 // - 1
4*ln(1/x)-1 = 0
4*ln(1/x)-1 = 0 // + 1
4*ln(1/x) = 1 // : 4
ln(1/x) = 1/4
ln(1/x) = ln(e^(1/4))
1/x = e^(1/4)
1/x-e^(1/4) = 0
1*x^-1 = e^(1/4) // : 1
x^-1 = e^(1/4)
-1 < 0
1/(x^1) = e^(1/4) // * x^1
1 = e^(1/4)*x^1 // : e^(1/4)
1/(e^(1/4)) = x^1
x = 1/(e^(1/4))
x = 1/(e^(1/4))
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