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D( m )
m+6 = 0
m = 0
m+6 = 0
m+6 = 0
m+6 = 0 // - 6
m = -6
m = 0
m = 0
m in (-oo:-6) U (-6:0) U (0:+oo)
360/m = 360/(m+6)+2 // - 360/(m+6)+2
360/m-(360/(m+6))-2 = 0
360/m-360*(m+6)^-1-2 = 0
360/m-360/(m+6)-2 = 0
(-360*m)/(m*(m+6))+(360*(m+6))/(m*(m+6))+(-2*m*(m+6))/(m*(m+6)) = 0
360*(m+6)-2*m*(m+6)-360*m = 0
2160-2*m^2-12*m = 0
2160-2*m^2-12*m = 0
2*(1080-m^2-6*m) = 0
1080-m^2-6*m = 0
DELTA = (-6)^2-(-1*4*1080)
DELTA = 4356
DELTA > 0
m = (4356^(1/2)+6)/(-1*2) or m = (6-4356^(1/2))/(-1*2)
m = -36 or m = 30
2*(m+36)*(m-30) = 0
(2*(m+36)*(m-30))/(m*(m+6)) = 0
(2*(m+36)*(m-30))/(m*(m+6)) = 0 // * m*(m+6)
2*(m+36)*(m-30) = 0
( m+36 )
m+36 = 0 // - 36
m = -36
( m-30 )
m-30 = 0 // + 30
m = 30
m in { -36, 30 }
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