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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/m = 4 // - 4
2/m-4 = 0
2*m^-1 = 4 // : 2
m^-1 = 2
-1 < 0
1/(m^1) = 2 // * m^1
1 = 2*m^1 // : 2
1/2 = m^1
m = 1/2
m = 1/2
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