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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/3 = x^-180 // - x^-180
1/3-x^-180 = 0
-1*x^-180 = -1/3 // : -1
x^-180 = 1/3
-180 < 0
1/(x^180) = 1/3 // * x^180
1 = 1/3*x^180 // : 1/3
3 = x^180
x^180 = 3 // ^ 1/180
abs(x) = 3^(1/180)
x = 3^(1/180) or x = -3^(1/180)
x in { 3^(1/180), -3^(1/180) }
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