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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
48/1 = 300/m // - 300/m
48/1-(300/m) = 0
48-300*m^-1 = 0
-300*m^-1 = -48 // : -300
m^-1 = 4/25
-1 < 0
1/(m^1) = 4/25 // * m^1
1 = 4/25*m^1 // : 4/25
25/4 = m^1
m = 25/4
m = 25/4
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