- #1

rar0308

- 56

- 0

## Homework Statement

see the pictures

## Homework Equations

## The Attempt at a Solution

one.

In the third picture.

3rd line and 4th line. i don't understand why 1-e^(-t^2/n^2) become (1+t^2)/n^2

two.

I'm not familiar with proving equality by showing difference going to zero.

for example, I prove equality by showing that A equal B, B equal C, so A equal C.

What is a good book to learn this way of proof ?