# Series Proof help!

1. ### emc92

33
(1) Show that |ln 2 - ƩNn=1 ((-1)n-1)(1/n)| ≤ 1/(N+1)
(2) Show that |sin x - ƩNn=0 ((-1)n)/(2n+1)!| ≤ |x|2N+2/(2N+2)!

I really don't know where to start. should I change the sums to series first then work my way through? Please help!

2. ### Dick

25,852
Those are alternating series. The error bound is just the next element of the series.

3. ### emc92

33
ohhhhh wow now i see. thanks so much!