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