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Homework Statement
The problem along with its detailed solution are attached.
Homework Equations
Inequality, infinite summation and improper integral.
The Attempt at a Solution
I'm following the solution but I can't justify the first (and only) less-than-or-equal sign. Why is that sum less-than-or-equal to that integral?
Also, to be picky, when they say two-decimal place accuracy, shouldn't that mean error <= 5/10^3 instead of error < 5/10^3? Whether I am right or wrong, please tell me why.
Any input would be greatly appreciated!
Thanks in advance!