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lim(x→∞)[sinx/x+xsin(1/2x)]
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求极限lim{[(sinx)/x]+xsin(1/2x)}
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lim(x→0)(1-x^2-e^-x)/sinx
求极限 1,lim(x→∞)(sinx/x +100) 2,lim(x→∞)xtan1/x 3,lim(x→1)sin^
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