This is my question:

Given (1/6)*pi^2-(Sum(1/n^2, n = 1 .. N)) < 0.1e-2, how would would I find the smallest N such that the inequality holds?

I tried using solve command to no avail. Any suggestions?

I was doing some practice problems for Maple, when I encountered this problem:

My code is

w:=x+2+sin(x+2);

subs(x+2=u,w);

The output however did not change both `x+2`'s into `u`.

The output was: x+2+sin(u)

Any ideas as to why? Thanks in advance.