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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
m^-12*(((-2*m^3)/1)/16) = 0
m^-12*((-2*m^3)/16) = 0
-1/8*m^-9 = 0 // : -1/8
m^-9 = 0
m naleu017Cy do O
m belongs to the empty set
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