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