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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
-ln(2)/k = 91.2 // - 91.2
-ln(2)/k-91.2 = 0
-ln(2)*k^-1 = 91.2 // : -ln(2)
k^-1 = -91.2*(ln(2))^-1
-1 < 0
1/(k^1) = -91.2*(ln(2))^-1 // * k^1
1 = -91.2*(ln(2))^-1*k^1 // : -91.2*(ln(2))^-1
-0.01096491*ln(2) = k^1
k = -0.01096491*ln(2)
k = -0.01096491*ln(2)
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