Double and Half Angle Trouble...

There are two equations in my HW that im having trouble with. They happen to be next to each other so I took a picture.

They are separated by a white line, the answer I got is in blue and the answer the book gives is in red.

Really appreciate the assistance, as I have a test tomorrow and this stuff will be included.

First one is half angle, second is double..

http://img5.imageshack.us/img5/980/img0558p.jpg

What am I missing here? The formulas are correct, and I believe I'm doing them right.