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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^4+1/(x^4) = 23 // - 23
x^4+1/(x^4)-23 = 0
x^4+x^-4-23 = 0
t_1 = x^4
1*t_1^1+1*t_1^-1-23 = 0
1*t_1^1+1*t_1^-1-23*t_1^0 = 0
(1*t_1^2-23*t_1^1+1*t_1^0)/(t_1^1) = 0 // * t_1^2
t_1^1*(1*t_1^2-23*t_1^1+1*t_1^0) = 0
t_1^1
t_1^2-23*t_1+1 = 0
t_1^2-23*t_1+1 = 0
DELTA = (-23)^2-(1*1*4)
DELTA = 525
DELTA > 0
t_1 = (525^(1/2)+23)/(1*2) or t_1 = (23-525^(1/2))/(1*2)
t_1 = (5*21^(1/2)+23)/2 or t_1 = (23-5*21^(1/2))/2
t_1 in { (23-5*21^(1/2))/2, (5*21^(1/2)+23)/2}
t_1 = (23-5*21^(1/2))/2
x^4-((23-5*21^(1/2))/2) = 0
1*x^4 = (23-5*21^(1/2))/2 // : 1
x^4 = (23-5*21^(1/2))/2
x^4 = (23-5*21^(1/2))/2 // ^ 1/4
abs(x) = ((23-5*21^(1/2))^(1/4))/(2^(1/4))
x = ((23-5*21^(1/2))^(1/4))/(2^(1/4)) or x = -(((23-5*21^(1/2))^(1/4))/(2^(1/4)))
t_1 = (5*21^(1/2)+23)/2
x^4-((5*21^(1/2)+23)/2) = 0
1*x^4 = (5*21^(1/2)+23)/2 // : 1
x^4 = (5*21^(1/2)+23)/2
x^4 = (5*21^(1/2)+23)/2 // ^ 1/4
abs(x) = ((5*21^(1/2)+23)^(1/4))/(2^(1/4))
x = ((5*21^(1/2)+23)^(1/4))/(2^(1/4)) or x = -(((5*21^(1/2)+23)^(1/4))/(2^(1/4)))
x in { ((23-5*21^(1/2))^(1/4))/(2^(1/4)), -(((23-5*21^(1/2))^(1/4))/(2^(1/4))), ((5*21^(1/2)+23)^(1/4))/(2^(1/4)), -(((5*21^(1/2)+23)^(1/4))/(2^(1/4))) }
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