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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/3 = 64/k // - 64/k
4/3-(64/k) = 0
4/3-64*k^-1 = 0
-64*k^-1 = -4/3 // : -64
k^-1 = 1/48
-1 < 0
1/(k^1) = 1/48 // * k^1
1 = 1/48*k^1 // : 1/48
48 = k^1
k = 48
k = 48
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