;; -*- mode: imath -*-
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;; (C) 2004 Yasuaki Honda (yhonda@mac.com)

Q: Find the value of a formula for .

A: Let's define x as the value of the given formula:
.
Then x satisfies the formula .
Remember , take square of the formula, we obtain
. The solution of the formula is:



Since , we know that the latter is the answer.
.