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D( k )
2*k = 0
2*k = 0
2*k = 0
2*k = 0 // : 2
k = 0
k in (-oo:0) U (0:+oo)
(k-3)/(2*k) = (3/6)*k-(1/4) // - (3/6)*k-(1/4)
(k-3)/(2*k)-((3/6)*k)+1/4 = 0
(k-3)/(2*k)+(-1/2)*k+1/4 = 0
(k-3)/(2*k)-k/2+1/4 = 0
(2*4*(k-3))/(2*2*4*k)+(2*4*(-k)*k)/(2*2*4*k)+(1*2*2*k)/(2*2*4*k) = 0
2*4*(k-3)+2*4*(-k)*k+1*2*2*k = 0
8*k-8*k^2+4*k-24 = 0
12*k-8*k^2-24 = 0
12*k-8*k^2-24 = 0
4*(3*k-2*k^2-6) = 0
3*k-2*k^2-6 = 0
DELTA = 3^2-(-6*(-2)*4)
DELTA = -39
DELTA < 0
4 = 0
4/(2*2*4*k) = 0
4/(2*2*4*k) = 0 // * 2*2*4*k
4 = 0
k belongs to the empty set
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