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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 16 // - 16
4/y-16 = 0
4*y^-1 = 16 // : 4
y^-1 = 4
-1 < 0
1/(y^1) = 4 // * y^1
1 = 4*y^1 // : 4
1/4 = y^1
y = 1/4
y = 1/4
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