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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = (14^(1/2)-1)/4 // - (14^(1/2)-1)/4
3/x-((14^(1/2)-1)/4) = 0
3*x^-1 = (14^(1/2)-1)/4 // : 3
x^-1 = (14^(1/2)-1)/12
-1 < 0
1/(x^1) = (14^(1/2)-1)/12 // * x^1
1 = ((14^(1/2)-1)/12)*x^1 // : (14^(1/2)-1)/12
12*(14^(1/2)-1)^-1 = x^1
x = 12*(14^(1/2)-1)^-1
x = 12*(14^(1/2)-1)^-1
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