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D( k )
4^(1/2)*k^(7/2) = 0
4*k^-3 = 0
k = 0
k < 0
4^(1/2)*k^(7/2) = 0
4^(1/2)*k^(7/2) = 0
2*k^(7/2) = 0 // : 2
k^(7/2) = 0
k = 0
4*k^-3 = 0
4*k^-3 = 0
4*k^-3 = 0 // : 4
k^-3 = 0
k należy do O
k = 0
k = 0
k < 0
k in (0:+oo)
(3*k^2*(4*k^-3)^-1)/(4^(1/2)*k^(7/2)) = 0
3/8*k^(3/2) = 0 // : 3/8
k^(3/2) = 0
k = 0
k in { 0}
k belongs to the empty set
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