(-1) n=0 "”(2n+1) 0m21递推公式 6a, 2+1) 6 m=20=2-a16+a0/5!a2=1/36-1/57 360 1+-z2+ SIn z 6 3600 1 (2 1)! ( 1) 0 =  + − = − m n a m n n m n m =1 0, (2 1)! ( 1) 1 1 0 = + − a + a 6a1 = a0 . 6 1 a1 = m = 2 递推公式 0 / 6 / 5! = a2 − a1 + a0 360 7 1/ 36 1/ 5! a2 = − =  = + 2 + 4 + 360 7 6 1 1 sin z z z z