bn = 1 / (2n-1) (2n) 합

bn = 1 / (2n-1) (2n) 합

1/ [(2n-1)(2n)] = -1/(2n) + 1/(2n-1)
b1= -1/2 + 1/1
b2 = -1/4 + 1/3
b3= -1/6 + 1/5
b4= -1/8 + 1/7
무해.제목이 잘못 쓰였나요?