lim(x-∞)(e^x+cosx)/(e^x-sinx)=本人比较愚钝,
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lim(e^x)cosx= x→+∞
lim(x-∞)(e^x+cosx)/(e^x-sinx)=本人比较愚钝,
lim(x-cosx)/x x→-∞
lim[cosx/(e^x+e^-x]x→+∞,求极限,要过程哦.
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