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D( x )
x^4 = 0
x = 0
x^2 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+(1/(x^4))/(x^2) = 0
4*x^-1+x^-6 = 0
t_1 = x^-1
1*t_1^6+4*t_1^1 = 0
t_1^6+4*t_1 = 0
t_1*(t_1^5+4) = 0
1*t_1^5 = -4 // : 1
t_1^5 = -4
t_1^5 = -4 // ^ 1/5
t_1 = -4^(1/5)
t_1 = 0
t_1 = 0
t_1 = -4^(1/5)
x^-1+4^(1/5) = 0
1*x^-1 = -4^(1/5) // : 1
x^-1 = -4^(1/5)
-1 < 0
1/(x^1) = -4^(1/5) // * x^1
1 = -4^(1/5)*x^1 // : -4^(1/5)
1/(-4^(1/5)) = x^1
x = 1/(-4^(1/5))
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x = 1/(-4^(1/5))
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