- #1

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## Homework Statement

http://img90.imageshack.us/img90/8280/picture1mc2.png [Broken]

In my answer guide, how do I eliminate h from the beginning part of this equation? Can someone give me hints to fill in the missing gap?

## Homework Equations

None

## The Attempt at a Solution

I don't know how to get rid of h first. :(

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