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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5 = 6.2/k // - 6.2/k
5-(6.2/k) = 0
5-6.2*k^-1 = 0
-6.2*k^-1 = -5 // : -6.2
k^-1 = 0.80645161
-1 < 0
1/(k^1) = 0.80645161 // * k^1
1 = 0.80645161*k^1 // : 0.80645161
1.24 = k^1
k = 1.24
k = 1.24
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