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D( K )
e^10 = 0
e^10 = 0
e^10 = 0
e^10 = 0
K belongs to the empty set
K in (-oo:+oo)
1/5 = ((e^3*K)/(e^10))*K // - ((e^3*K)/(e^10))*K
1/5-(((e^3*K)/(e^10))*K) = 0
1/5-(e^-7*K^2) = 0
-e^-7*K^2 = -1/5 // : -e^-7
K^2 = 1/5/(e^-7)
K^2 = 1/5/(e^-7) // ^ 1/2
abs(K) = ((1/5)^(1/2))/(e^(-7/2))
K = ((1/5)^(1/2))/(e^(-7/2)) or K = -(((1/5)^(1/2))/(e^(-7/2)))
K in { ((1/5)^(1/2))/(e^(-7/2)), -(((1/5)^(1/2))/(e^(-7/2))) }
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