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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m^-6 = 1/2 // - 1/2
m^-6-(1/2) = 0
m^-6-1/2 = 0
1*m^-6 = 1/2 // : 1
m^-6 = 1/2
-6 < 0
1/(m^6) = 1/2 // * m^6
1 = 1/2*m^6 // : 1/2
2 = m^6
m^6 = 2 // ^ 1/6
abs(m) = 2^(1/6)
m = 2^(1/6) or m = -2^(1/6)
m in { 2^(1/6), -2^(1/6) }
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