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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
1.5625 = (k+9)/k // - (k+9)/k
1.5625-((k+9)/k) = 0
(-1*(k+9))/k+1.5625 = 0
(-1*(k+9))/k+(1.5625*k)/k = 0
1.5625*k-1*(k+9) = 0
0.5625*k-9 = 0
(0.5625*k-9)/k = 0
(0.5625*k-9)/k = 0 // * k
0.5625*k-9 = 0
0.5625*k-9 = 0 // + 9
0.5625*k = 9 // : 0.5625
k = 9/0.5625
k = 16
k = 16
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