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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3.6/y = 1.2/2 // - 1.2/2
3.6/y-(1.2/2) = 0
3.6/y-0.6 = 0
3.6*y^-1 = 0.6 // : 3.6
y^-1 = 0.16666667
-1 < 0
1/(y^1) = 0.16666667 // * y^1
1 = 0.16666667*y^1 // : 0.16666667
5.99999988 = y^1
y = 5.99999988
y = 5.99999988
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