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??? ?? ln1)ln()ln( 1)ln( ln1 22 16. Cxxdxxdxxdxxxx ??????? ??? 222244 s i na rc t a n21)(s i n)(s i n1 121s i ns i n1 s i ns i n1 c o ss i n 17. ? xdxx 3cos2sin Cxxdxxx ?????? ? c o s215c o s101)s i n5(s i n21 五、計(jì)算下列不定積分 : 1. ?? 32 )2( xdx 解:令 ?????? ???? 2t2s i nt2x ??,則 costdt2dx ? . 所以 ? ?? ?? ???????? .C22Ct a n21s e t21c os2c os2)2( 22332 xxtt dttt dtxdx 2. ?? 32 )1(xdx 解 Ctt dttdttxx dx ?????? ??? s i nc ostan)1(t a n 1tan)1( 3232 令 Cxx ??? 12 . 3. dxxx? ?92 班級(jí) 姓名 學(xué)號(hào) 5 解 x3 時(shí), ??? ???? t d ttdtttxdxxx 222 t a n3)s e c3(s e c3 9s e c9s e c39 令 CxxCttdtt ????????? ? 3a rc c os393t a n3)1c os 1(3 22 x3 時(shí),令 x= u, ?? ??? duuudxxx 99 22 = Cuu ??? 3a rc c os392 = Cxx ???? 3a rc c os392 4. ?? xedx1 解 ?????????????? duuuduuuduueedxxx )1111(112)1l n (111 22令 . Ceecuu xx ??? ??????? 11 11ln|11|ln. 5. ??? xdx11 ?? ?????? ?? dttdttttx )111(2)2(1 11 Cxxctt ?????????? )11l n(212)1ln(2 6. dxxxx x? ? )( 33 解 dtttdttttt ttxdxxxx x )111(66)()( 52362633 ??????? ??? 令 Cx xCt t ?????? 66 )1(ln1ln6. 7. ??? xxdx 1)2( ?? ??????? ?? dttdtttttx 112)2()1( 1 221 .1a r c t a n2a r c t a n2 Cxct ??????? 班級(jí) 姓名 學(xué)號(hào) 6 8. ??12xx dx 解 x1 時(shí), CxCtdtt d tttttxxx dx ????????? ??? 1a rc c o st a ns e ct a ns e c 1s e c12 令. 或 Cxxdxdxxxxxdx ???????? ??? 1a r c c o s11111111 2222 x1 時(shí),令 x= u, CxCuuu duxx dx ???????? ?? 1a rc c os1a r