⑩天掌 Teaching Plan on Advanced Mathematics o 0,m≠n sin mx sinnxdx TC. =n cos mx cos nrds/o n≠n 7. =n sin mx cos ndx=0.(其中m,n=1,2,) tianjin polytechnic dmivendityTianjin Polytechnic University Teaching Plan on Advanced Mathematics , , 0, sin sin     =  =   − m n m n mx nxdx , , 0, cos cos     =  =   − m n m n mx nxdx sin cos = 0.   − mx nxdx (其中m,n = 1,2, )