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D( X )
ln(X) = 0
X <= 0
ln(X) = 0
ln(X) = 0
ln(X) = ln(e^0)
X = e^0
X = 1
X <= 0
X in (0:1) U (1:+oo)
ln(0.5)/ln(X) = 20 // - 20
ln(0.5)/ln(X)-20 = 0
t_2 = ln(X)
ln(0.5)/t_2-20 = 0
ln(0.5)*t_2^-1 = 20 // : ln(0.5)
t_2^-1 = 20/ln(0.5)
-1 < 0
1/(t_2^1) = 20/ln(0.5) // * t_2^1
1 = (20/ln(0.5))*t_2^1 // : 20/ln(0.5)
1/(20/ln(0.5)) = t_2^1
t_2 = 1/(20/ln(0.5))
ln(X) = 1/(20/ln(0.5))
ln(X) = ln(e^(1/(20/ln(0.5))))
X = e^(1/(20/ln(0.5)))
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