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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/33 = 4/w // - 4/w
1/33-(4/w) = 0
1/33-4*w^-1 = 0
-4*w^-1 = -1/33 // : -4
w^-1 = 1/132
-1 < 0
1/(w^1) = 1/132 // * w^1
1 = 1/132*w^1 // : 1/132
132 = w^1
w = 132
w = 132
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