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Y in (-oo:+oo)
(1/4)*Y^4-9 = 0
1/4*Y^4 = 9 // : 1/4
Y^4 = 36
Y^4 = 36 // ^ 1/4
abs(Y) = 36^(1/4)
Y = 36^(1/4) or Y = -36^(1/4)
Y in { 36^(1/4), -36^(1/4) }
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