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