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数学
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lim(x→0)(1+3tan^2(x))^cot^2(x)=?
人气:233 ℃ 时间:2020-06-13 06:59:15
解答
楼上的是取指数,再取对数,其实这个题目就是两个重要极限:lim(x→∞)(1+1/x)^x=e注意到tanx和cotx互为倒数,因此lim(x→0)(1+3tan^2(x))^cot^2(x)=lim(x→0)(1+3tan^2(x))^[1/tan^2(x)]=lim(x→0)(1+3tan^2(x))...
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