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