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D( x )
64*x < 0
64*x < 0
64*x < 0
64*x+0 < 0 // - 0
64*x < 0 // : 64
x < 0/64
x < 0
x in <0:+oo)
(64*x)^(1/4)-x = 0
2*4^(1/4)*x^(1/4)-x = 0
t_1 = x^(1/4)
2*4^(1/4)*t_1^1-1*t_1^4 = 0
2*4^(1/4)*t_1-t_1^4 = 0
t_1*(2*4^(1/4)-t_1^3) = 0
-1*t_1^3 = -(2*4^(1/4)) // : -1
t_1^3 = 2*4^(1/4)
t_1^3 = 2*4^(1/4) // ^ 1/3
t_1 = 2^(1/3)*4^(1/12)
t_1 = 0
t_1 = 0
t_1 = 2^(1/3)*4^(1/12)
x^(1/4)-(2^(1/3)*4^(1/12)) = 0
1*x^(1/4) = 2^(1/3)*4^(1/12) // : 1
x^(1/4) = 2^(1/3)*4^(1/12)
x^(1/4) = 2^(1/3)*4^(1/12) // ^ 4
x = 2^(4/3)*4^(1/3)
t_1 = 0
x^(1/4)+0 = 0
x^(1/4) = 0
1*x^(1/4) = 0 // : 1
x^(1/4) = 0
x = 0
x in { 2^(4/3)*4^(1/3), 0 }
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