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sin2x/x=2sin2x/(2x) 2x趨於0 所以2sin2x/2x極限=2×1=2 2/x趨於無窮 所以sin(2/x)有界 x是無窮小 所以x*sin(2/x)趨於0 即x趨於0,極限是0 所以原極限=2-0=2
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