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m in (-oo:+oo)
(1/4)*m^2*(8*m^5-4) = 0
1/4*m^2*(8*m^5-4) = 0
( 1/4*m^2 )
1/4*m^2 = 0 // : 1/4
m^2 = 0
m = 0
( 8*m^5-4 )
8*m^5 = 4 // : 8
m^5 = 1/2
m^5 = 1/2 // ^ 1/5
m = (1/2)^(1/5)
m in { 0, (1/2)^(1/5) }
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