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答: 原式 =limx->2 (x^2-4)/[(x+2)sin(x^2-4)] 因為x->2,所以limx->2 x^2-4=0 所以limx->2 (x^2-4)/sin(x^2-4)=1 原式 =limx->2 1/(x+2) =1/4
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