Hello, chancey!

Find the exact value of

You're expected to know the double-angle identities:

. .

Let

We have: .

Rationalize: .

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- October 22nd 2006, 10:25 PM #1

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- October 22nd 2006, 11:59 PM #2

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- October 23rd 2006, 12:00 AM #3

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