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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
5*m-(2/m)-3+3 = -3 // + 3
5*m-(2/m)-3+3+3 = 0
5*m-2*m^-1-3+3+3 = 0
5*m^1-2*m^-1+3*m^0 = 0
(5*m^2+3*m^1-2*m^0)/(m^1) = 0 // * m^2
m^1*(5*m^2+3*m^1-2*m^0) = 0
m^1
5*m^2+3*m-2 = 0
5*m^2+3*m-2 = 0
DELTA = 3^2-(-2*4*5)
DELTA = 49
DELTA > 0
m = (49^(1/2)-3)/(2*5) or m = (-49^(1/2)-3)/(2*5)
m = 2/5 or m = -1
m in { -1, 2/5}
m in { -1, 2/5 }
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