3、cosxdxInn2n00三角函数的有理式积分:22u1ux2dusinx, cosx, utg,dx2221u1u21u∑11ex=nx;x2( 1;+1)n!n=0sinx121415161731819(9)e=1+x+x x x x+x+x+x+ox28152409057605670tanx12133437559613778718416419(9)e=1+x+x+x+x+x+x+x+x+x+ox2281202407205760362880∑1( 1)n2n+1sinx=x;x2( 1;+1)(2n+1)!n=0∑1( 1)ncosx=x2n;x