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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4.1/m = 2.5/34.5 // - 2.5/34.5
4.1/m-(2.5/34.5) = 0
4.1/m-0.07246377 = 0
4.1*m^-1 = 0.07246377 // : 4.1
m^-1 = 0.01767409
-1 < 0
1/(m^1) = 0.01767409 // * m^1
1 = 0.01767409*m^1 // : 0.01767409
56.57999931 = m^1
m = 56.57999931
m = 56.57999931
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