作业帮计算lim(x,y)→（2,2）sin[(x-1)^2-(y-1)^2]/(x-y)
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计算lim(x,y)→（2,2）sin[(x-1)^2-(y-1)^2]/(x-y)
计算lim(x,y)→（2,2）sin[(x-1)^2-(y-1)^2]/(x-y)
计算lim(x,y)→（2,2）sin[(x-1)^2-(y-1)^2]/(x-y)