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