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