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D( x )
x^9 = 0
x^9 = 0
x^9 = 0
1*x^9 = 0 // : 1
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 1/(x^9) // - 1/(x^9)
y-(1/(x^9)) = 0
y-x^-9 = 0
-1*x^-9 = -y // : -1
x^-9 = y
-9 < 0
1/(x^9) = y // * x^9
1 = x^9*y // : y
1/y = x^9
x^9 = 1/y // ^ 1/9
x = 1/(y^(1/9))
x = 1/(y^(1/9))
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