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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y-(3/y) = 9/10 // - 9/10
y-(3/y)-(9/10) = 0
y-3*y^-1-9/10 = 0
1*y^1-3*y^-1-9/10*y^0 = 0
(1*y^2-9/10*y^1-3*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2-9/10*y^1-3*y^0) = 0
y^1
y^2+(-9/10)*y-3 = 0
y^2+(-9/10)*y-3 = 0
DELTA = (-9/10)^2-(-3*1*4)
DELTA = 1281/100
DELTA > 0
y = ((1281/100)^(1/2)-(-9/10))/(1*2) or y = (-(-9/10)-(1281/100)^(1/2))/(1*2)
y = ((1281/100)^(1/2)+9/10)/2 or y = (9/10-(1281/100)^(1/2))/2
y in { (9/10-(1281/100)^(1/2))/2, ((1281/100)^(1/2)+9/10)/2}
y in { (9/10-(1281/100)^(1/2))/2, ((1281/100)^(1/2)+9/10)/2 }
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