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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
k^-2*((1*k)/4) = 0
k^-2*(k/4) = 0
1/4*k^-1 = 0 // : 1/4
k^-1 = 0
k naleu017Cy do O
k belongs to the empty set
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