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D( x )
x <= 0
x <= 0
x in (0:+oo)
((6*ln(x))/2)*ln(x) = 0
k_1 = ln(x)
3*k_1^2 = 0 // : 3
k_1^2 = 0
k_1 = 0
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
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