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D( k )
k < 0
2*k < 0
k < 0
2*k < 0
2*k < 0
2*k+0 < 0 // - 0
2*k < 0 // : 2
k < 0/2
k < 0
k in <0:+oo)
4*(2*k)^(1/4)*k^(3/4) = 0
4*2^(1/4)*k = 0 // : 4*2^(1/4)
k = 0
k = 0
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