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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(13/2)*y-(5/y) = 2/6 // - 2/6
(13/2)*y-(5/y)-(2/6) = 0
(13/2)*y-5*y^-1-1/3 = 0
13/2*y^1-5*y^-1-1/3*y^0 = 0
(13/2*y^2-1/3*y^1-5*y^0)/(y^1) = 0 // * y^2
y^1*(13/2*y^2-1/3*y^1-5*y^0) = 0
y^1
(13/2)*y^2+(-1/3)*y-5 = 0
(13/2)*y^2+(-1/3)*y-5 = 0
DELTA = (-1/3)^2-(-5*4*(13/2))
DELTA = 1171/9
DELTA > 0
y = ((1171/9)^(1/2)-(-1/3))/(2*(13/2)) or y = (-(-1/3)-(1171/9)^(1/2))/(2*(13/2))
y = ((1171/9)^(1/2)+1/3)/13 or y = (1/3-(1171/9)^(1/2))/13
y in { (1/3-(1171/9)^(1/2))/13, ((1171/9)^(1/2)+1/3)/13}
y in { (1/3-(1171/9)^(1/2))/13, ((1171/9)^(1/2)+1/3)/13 }
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