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D( X )
0.008/X <= 0
X = 0
0.008/X <= 0
0.008/X <= 0
0.008*X^-1 <= 0
0.008*X^-1 <= 0 // : 0.008
X^-1 <= 0/0.008
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 = 0
X = 0
X in (0:+oo)
ln(0.008/X) = 1 // - 1
ln(0.008/X)-1 = 0
ln(0.008/X)-1 = 0 // + 1
ln(0.008/X) = 1
ln(0.008/X) = ln(e^1)
0.008/X = e^1
0.008/X-e^1 = 0
0.008*X^-1 = e // : 0.008
X^-1 = 125*e
-1 < 0
1/(X^1) = 125*e // * X^1
1 = 125*e*X^1 // : 125*e
1/(125*e) = X^1
X = 1/(125*e)
X = 1/(125*e)
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