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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/5.6 = 1/k // - 1/k
4/5.6-(1/k) = 0
4/5.6-k^-1 = 0
-1*k^-1 = -0.71428571 // : -1
k^-1 = 0.71428571
-1 < 0
1/(k^1) = 0.71428571 // * k^1
1 = 0.71428571*k^1 // : 0.71428571
1.40000001 = k^1
k = 1.40000001
k = 1.40000001
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