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D( x )
x^12 = 0
x^12 = 0
x^12 = 0
1*x^12 = 0 // : 1
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^9-(12*x^7))/(x^12) = 0
(6*x^9-12*x^7)/(x^12) = 0
6*x^9-12*x^7 = 0
6*x^7*(x^2-2) = 0
1*x^2 = 2 // : 1
x^2 = 2
x^2 = 2 // ^ 1/2
abs(x) = 2^(1/2)
x = 2^(1/2) or x = -2^(1/2)
6*x^7*(x-2^(1/2))*(x+2^(1/2)) = 0
(6*x^7*(x-2^(1/2))*(x+2^(1/2)))/(x^12) = 0
( 6*x^7 )
6*x^7 = 0 // : 6
x^7 = 0
x = 0
( x+2^(1/2) )
x+2^(1/2) = 0 // - 2^(1/2)
x = -2^(1/2)
( x-2^(1/2) )
x-2^(1/2) = 0 // + 2^(1/2)
x = 2^(1/2)
x in { 0}
x in { -2^(1/2), 2^(1/2) }
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