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D( k )
(4*k-1)/(2*k) = 0
2*k = 0
4*k = 0
(4*k-1)/(2*k) = 0
(4*k-1)/(2*k) = 0
4*k-1 = 0 // + 1
4*k = 1 // : 4
k = 1/4
2*k = 0
2*k = 0
2*k = 0 // : 2
k = 0
4*k = 0
4*k = 0
4*k = 0 // : 4
k = 0
k in (-oo:0) U (0:1/4) U (1/4:+oo)
((k+2)/(4*k))/((4*k-1)/(2*k)) = 0
(2*k*(k+2))/(4*k*(4*k-1)) = 0
( 2*k )
2*k = 0 // : 2
k = 0
( k+2 )
k+2 = 0 // - 2
k = -2
k in { 0}
k = -2
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