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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
21/8.1 = 105/m // - 105/m
21/8.1-(105/m) = 0
21/8.1-105*m^-1 = 0
-105*m^-1 = -2.59259259 // : -105
m^-1 = 0.02469136
-1 < 0
1/(m^1) = 0.02469136 // * m^1
1 = 0.02469136*m^1 // : 0.02469136
40.49999676 = m^1
m = 40.49999676
m = 40.49999676
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