[分析] 初微(36)

[PttFund (批踢踢基金只進不出)]

Let

                    sin x‧sin^3 y
        f(x,y)= ---------------------.
                 1 - cos (x^2 + y^2)

Show that     lim      f(x,y) doesn't exist.
          (x,y)→(0,0)


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