showgan@tg => YSITD: 1/[a(a+1)] -> 1/a - 1/a+1 #5a96ee3e22144b28ef4f288c

showgan@tg says to YSITD

1/[a(a+1)] -> 1/a - 1/a+1

at Thu, Mar 1, 2018 2:00 AM