微積分課件換元積分法5(文件)
【正文】 )( a r c t a n 2小結(jié) ??xxxf dc o s)( s i n? ?xxxf ds i n)( c o s? xxf d s i n)( s i n?? xxf d c o s)( c o s? xxf ta nd)(ta n?? xxf cotd)(cot? xxf arc ta nd)(a rct anCxf ?)(ln? x x f arcsin d ) (arcsin ? ? ? x x f x f d ) ( ) ( ? ? ) ( ) ( d x f x f 例 50( 1 ) ( 2 )x dx??221( 2 ) dxax??221( 3 ) dxax?? 221( 4 ) dxax??( 5 ) t a n x dx? 1( 6 )lndxxx?例 （ 4） )0(d1 22 ??? axxa解 :因?yàn)? ?? 221xa原式 = ?????????? ? xxaxxaa d1d121? ? Cxaxaa ????? lnln2 1 Cxa xaa ???? ln21????????? xaxaa1121)0(ln21d122 ???????aCaxaxaxax例
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鄂ICP備17016276號(hào)-1