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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1.6/y = 0.2*y // - 0.2*y
1.6/y-(0.2*y) = 0
1.6/y-0.2*y = 0
1.6*y^-1-0.2*y = 0
y^-1*(1.6-0.2*y^2) = 0
-0.2*y^2 = -1.6 // : -0.2
y^2 = 8
y^2 = 8 // ^ 1/2
abs(y) = 2*2^(1/2)
y = 2*2^(1/2) or y = -(2*2^(1/2))
1/y = 0
1*y^-1 = 0 // : 1
y^-1 = 0
y należy do O
y in { 2*2^(1/2), -(2*2^(1/2)) }
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