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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
16/m = 1/4 // - 1/4
16/m-(1/4) = 0
16/m-1/4 = 0
16*m^-1 = 1/4 // : 16
m^-1 = 1/64
-1 < 0
1/(m^1) = 1/64 // * m^1
1 = 1/64*m^1 // : 1/64
64 = m^1
m = 64
m = 64
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