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D( c )
c-2 = 0
c^2-(4*c)+4 = 0
c-2 = 0
c-2 = 0
c-2 = 0 // + 2
c = 2
c^2-(4*c)+4 = 0
c^2-(4*c)+4 = 0
c^2-4*c+4 = 0
c^2-4*c+4 = 0
DELTA = (-4)^2-(1*4*4)
DELTA = 0
c = 4/(1*2)
c = 2 or c = 2
c in (-oo:2) U (2:+oo)
1/(c-2)+1/(c-2)-(12/(c^2-(4*c)+4)) = 0
1/(c-2)+1/(c-2)-12*(c^2-4*c+4)^-1 = 0
1/(c-2)+1/(c-2)-12/(c^2-4*c+4) = 0
c^2-4*c+4 = 0
c^2-4*c+4 = 0
c^2-4*c+4 = 0
DELTA = (-4)^2-(1*4*4)
DELTA = 0
c = 4/(1*2)
c = 2 or c = 2
(c-2)^2 = 0
1/(c-2)+1/(c-2)-12/((c-2)^2) = 0
(1*(c-2))/((c-2)^2)+(1*(c-2))/((c-2)^2)-12/((c-2)^2) = 0
1*(c-2)+1*(c-2)-12 = 0
2*c-12-4 = 0
2*c-16 = 0
(2*c-16)/((c-2)^2) = 0
(2*c-16)/((c-2)^2) = 0 // * (c-2)^2
2*c-16 = 0
2*c-16 = 0 // + 16
2*c = 16 // : 2
c = 16/2
c = 8
c = 8
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