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## Homework Statement

Hey guys.

I have this equation in red (in the pic) which I need to solve

http://img241.imageshack.us/img241/9323/scan0004n.jpg [Broken]

As you can see I came up with with 2*t0.

When I solve it in Matematica I come up with t2=t0 without the 2.

Also, their answer in the book is also only t0.

Can someone please tell me where is my mistake please?

Thanks.

## Homework Equations

## The Attempt at a Solution

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