《高等数学》课程电子教案（PPT课件）Chapter 12 Infinite series Sec 7 Fourier Series

11Chapter中InfiniteSeriesSec.7FourierSeries

Chapter 11 Infinite Series Sec.7 Fourier Series

$7 Fourier SeriesI. Introduction-1.when -π≤t<0u(t)Periodic function1.when 0≤t<元uQ......i...........................................R.........................................1元........................元0................C

§7 Fourier Series I. Introduction o t u −  1 −1 Periodic function      − −   =   t t u t 1, when 0 1, when 0 ( )

$7 FourierSeriesI. Introductionu=-sint元u10.5t-212-13C

§7 Fourier Series u sint 4  = I. Introduction

$7 Fourier SeriesI. Introductionsin3t)(sint +u=3元3341

§7 Fourier Series sin3 ) 3 1 (sin 4 u t + t  = I. Introduction

$7 FourierSeriesI. Introduction(sint +=sin3t+sin5t)U=3元110.521132O

§7 Fourier Series sin5 ) 5 1 sin3 3 1 (sin 4 u t + t + t  = I. Introduction