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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
((m^7)/12)*(3*m+(m^-1)/2) = 0
1/12*m^7*(3*m+1/2*m^-1) = 0
3*m+1/2*m^-1 = 0
m^-1*(3*m^2+1/2) = 0
3*m^2 = -1/2 // : 3
m^2 = -1/6
1/m = 0
1/12*m^-1*m^7 = 0
( 1/12*m^7 )
1/12*m^7 = 0 // : 1/12
m^7 = 0
m = 0
( m^-1 )
1*m^-1 = 0 // : 1
m^-1 = 0
m naleu017Cy do O
m in { 0}
m belongs to the empty set
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