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D( W )
W = 0
W = 0
W = 0
W in (-oo:0) U (0:+oo)
725/364 = 627/W // - 627/W
725/364-(627/W) = 0
725/364-627*W^-1 = 0
-627*W^-1 = -725/364 // : -627
W^-1 = 725/228228
-1 < 0
1/(W^1) = 725/228228 // * W^1
1 = 725/228228*W^1 // : 725/228228
228228/725 = W^1
W = 228228/725
W = 228228/725
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