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k in (-oo:+oo)
0.25-((k^4)/16) = 0
-1/16*k^4 = -0.25 // : -1/16
k^4 = 4
k^4 = 4 // ^ 1/4
abs(k) = 4^(1/4)
k = 4^(1/4) or k = -4^(1/4)
k in { 4^(1/4), -4^(1/4) }
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