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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
16 = 8/w // - 8/w
16-(8/w) = 0
16-8*w^-1 = 0
-8*w^-1 = -16 // : -8
w^-1 = 2
-1 < 0
1/(w^1) = 2 // * w^1
1 = 2*w^1 // : 2
1/2 = w^1
w = 1/2
w = 1/2
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