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