当X趋于0时,X与Sinx(tanx+x^2)相比,哪一个是高阶无穷小

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• 英语翻译Dear Chen Jie,How is it going?Last Monday,we talked about our dreams in the class meeting．Some students didn’t know what they wanted to be in the future．But I said that I wanted to be an English teacher．I hope to be a good teacher,like Mr.Wu．He makes his math class interesting．He often tells us to work hard and try our best to achieve our dreams．What are you going to be when you grow up?Yours,Li MingLi Ming Dear Li Ming,Thanks for your letter.My d