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k in (-oo:+oo)
(64*k^2-9)/2 = 0
64*k^2 = 9 // : 64
k^2 = 9/64
k^2 = 9/64 // ^ 1/2
abs(k) = 3/8
k = 3/8 or k = -3/8
k in { 3/8, -3/8 }
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