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D( x )
x <= 0
x <= 0
x in (0:+oo)
ln(x) = 1/12 // - 1/12
ln(x)-(1/12) = 0
ln(x)-1/12 = 0
ln(x)-1/12 = 0 // + 1/12
ln(x) = 1/12
ln(x) = ln(e^(1/12))
x = e^(1/12)
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