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\frac{x(2-2cosx-xsinx)}{(1-cosx)(x-sinx)}, x ¸Üin(0, 2 ¸Üpi).

[ Last edited by laizuliang on 2008-3-9 at 23:28 ]
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[ Last edited by montclimber on 2008-3-9 at 22:14 ]
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