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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
6.4/m = 2 // - 2
6.4/m-2 = 0
6.4*m^-1 = 2 // : 6.4
m^-1 = 0.3125
-1 < 0
1/(m^1) = 0.3125 // * m^1
1 = 0.3125*m^1 // : 0.3125
3.2 = m^1
m = 3.2
m = 3.2
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