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发布日期:2021-11-20
法国数学家傅里叶认为,任何周期函数都可以用正弦函数和余弦函数构成的无穷级数来表示(选择正弦函数与余弦函数作为基函数是因为它们是正交的),后世称傅里叶级数为一种特殊的三角级数,根据欧拉公式,三角函数又能化成指数形式,也称傅立叶级数为一种指数级数。
开成(836年正月—840年十二月)是唐文宗的年号,共计5年。开成五年正月唐武宗李瀍即位沿用。
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The number of speakers of English in Shakespeare’s time is estimated (估计) to have been about five million. Today it is estimated that some 260 million people speak it as a native language, mainly in the United States, Canada, Great Britain, Ireland, South Africa, Australia and New Zealand. In addition to the standard varieties of English found in these areas, there are a great many regional and social varieties of the language as well as various levels of usage that are employed both in its spoken and written forms. In fact, it is impossible to estimate the number of people in the world who have acquired an adequate (足够的) working knowledge of English in addition to their own languages. The purpose for English learning and the situations in which such learning takes place are so varied that it is difficult to explain and still more difficult to judge what forms an adequate working knowledge for each situation. The main reason for the widespread demand for English is its present-day importance as a world language. Besides serving the indefinite needs of its native speakers, English is a language in which some of important works in science, technology, and other fields are being produced, and not always by native speakers. It is widely used for such purposes as meteorological and airport communications, international conferences, and the spread of information over the radio and television networks of many nations. It is a language of wider communication for a number of developing countries, especially former British colonies. Many of these countries have multilingual populations and need a language for internal communication in such matters as government, commerce, industry, law and education as well as for international communication and for entrance to the scientific and technological developments in the West.What forms an adequate working knowledge of English
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设(1)将f(x)展开成傅里叶级数;(2)求该傅里叶级数的和函数S(x)及S(6);(3)求的和;
设 (1)将f(x)展开成傅里叶级数; (2)求该傅里叶级数的和函数S(x)及S(6); (3)求的和。
设 (1)将f(x)展开成傅里叶级数; (2)求该傅里叶级数的和函数S(x)及S(6); (3)求的和。
设 ,若将f(x)展开成正弦级数,则该级数在 处收敛于()
函数f(x)=cos2x(-∞<x<+∞)展开成x的幂级数为()
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下列级数中,绝对收敛的级数是( )
下列级数中,绝对收敛的级数是( )。
函数1/x展开成(x-2)的幂级数是( )。
将函数f(x)=x2在 上展开成余弦级数,其形式为 ()