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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m^-8 = 1/2 // - 1/2
m^-8-(1/2) = 0
m^-8-1/2 = 0
1*m^-8 = 1/2 // : 1
m^-8 = 1/2
-8 < 0
1/(m^8) = 1/2 // * m^8
1 = 1/2*m^8 // : 1/2
2 = m^8
m^8 = 2 // ^ 1/8
abs(m) = 2^(1/8)
m = 2^(1/8) or m = -2^(1/8)
m in { 2^(1/8), -2^(1/8) }
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