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proof:

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abs(x)>A             ʱ£¬ f(x) ×ÛÉϿɵÃ
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Originally posted by shenswatch at 2010-05-17 23:24:51:
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e^(x^2)>=1+x^2+x^4/2>=1+(x^2+x^4)/2>=1+abs(x^3)
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abs(x^3/e^(x^2))<=abs(x^3)/(1+abs(x^3))<1
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