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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
((m^3)/4)*((m^-1)/2+5) = 0
1/4*m^3*(1/2*m^-1+5) = 0
( 1/2*m^-1+5 )
1/2*m^-1 = -5 // : 1/2
m^-1 = -10
-1 < 0
1/(m^1) = -10 // * m^1
1 = -10*m^1 // : -10
-1/10 = m^1
m = -1/10
( 1/4*m^3 )
1/4*m^3 = 0 // : 1/4
m^3 = 0
m = 0
m in { 0}
m = -1/10
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