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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2/m = 0.8/3.6 // - 0.8/3.6
2/m-(0.8/3.6) = 0
2/m-0.22222222 = 0
2*m^-1 = 0.22222222 // : 2
m^-1 = 0.11111111
-1 < 0
1/(m^1) = 0.11111111 // * m^1
1 = 0.11111111*m^1 // : 0.11111111
9.00000009 = m^1
m = 9.00000009
m = 9.00000009
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