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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/k-(6*k) = -3 // + 3
5/k-(6*k)+3 = 0
5/k-6*k+3 = 0
5*k^-1-6*k^1+3*k^0 = 0
(3*k^1-6*k^2+5*k^0)/(k^1) = 0 // * k^2
k^1*(3*k^1-6*k^2+5*k^0) = 0
k^1
3*k-6*k^2+5 = 0
3*k-6*k^2+5 = 0
DELTA = 3^2-(-6*4*5)
DELTA = 129
DELTA > 0
k = (129^(1/2)-3)/(-6*2) or k = (-129^(1/2)-3)/(-6*2)
k = (129^(1/2)-3)/(-12) or k = (129^(1/2)+3)/12
k in { (129^(1/2)-3)/(-12), (129^(1/2)+3)/12}
k in { (129^(1/2)-3)/(-12), (129^(1/2)+3)/12 }
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