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D( x )
x^11 <= 0
x^11 <= 0
x^11 <= 0
1*x^11 <= 0
1*x^11 <= 0 // : 1
x^11 <= 0/1
x^11 <= 0
x^11 <= 0 // ^ 1/11
x <= 0
x in (-oo:0>
x in (0:+oo)
ln(x^11)/9 = 0
1/9*ln(x^11) = 0 // : 1/9
ln(x^11) = 0
ln(x^11) = ln(e^0)
x^11 = e^0
x^11-e^0 = 0
1*x^11 = 1 // : 1
x^11 = 1
x^11 = 1 // ^ 1/11
x = 1
x = 1
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