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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(3/4)*y = 1000/y // - 1000/y
(3/4)*y-(1000/y) = 0
(3/4)*y-1000*y^-1 = 0
3/4*y^1-1000*y^-1 = 0
(3/4*y^2-1000*y^0)/(y^1) = 0 // * y^2
y^1*(3/4*y^2-1000*y^0) = 0
y^1
(3/4)*y^2-1000 = 0
(3/4)*y^2-1000 = 0
DELTA = 0^2-(-1000*4*(3/4))
DELTA = 3000
DELTA > 0
y = (3000^(1/2)+0)/(2*(3/4)) or y = (0-3000^(1/2))/(2*(3/4))
y = 20/3*30^(1/2) or y = -20/3*30^(1/2)
y in { -20/3*30^(1/2), 20/3*30^(1/2)}
y in { -20/3*30^(1/2), 20/3*30^(1/2) }
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