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## Homework Statement

write the following in K basis:

A=∫|x><x|dx where the integral limits are from -a to a

## Homework Equations

## The Attempt at a Solution

I tried solving it by inserting the identity

I=∫|k><k|dk where the integral limits are from -∞ to +∞

but then I do not know how to proceed from there. What to do about the two integrals with varying limits!