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D( k )
k^2 = 0
k^2 = 0
k^2 = 0
1*k^2 = 0 // : 1
k^2 = 0
k = 0
k in (-oo:0) U (0:+oo)
k^2+(((13*k)/(k^2))*k^2)/(k^2) = 0
k^2+13*k^-1 = 0
k^-1*(k^3+13) = 0
1*k^3 = -13 // : 1
k^3 = -13
k^3 = -13 // ^ 1/3
k = -13^(1/3)
1/k = 0
1*k^-1 = 0 // : 1
k^-1 = 0
k naleu017Cy do O
k = -13^(1/3)
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