I am trying to simplify the end of this half angle problem

How do I get from

to:

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- March 21st 2012, 11:40 AM #1

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- March 21st 2012, 11:58 AM #2

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## Re: Help

Working backwards:

Since the two is on the denominator it is essentially multiplying the (9-(17)^(1/2)) by 1/2. So to get 1/3 into the denominator you would square it, which becomes 1/9. then you would multiply it by everything else which will get the denominator to be 18.

Working Forwards:

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- March 25th 2012, 12:11 PM #3