page 131, 1- f) As done by moi.

Alrighty, so I basically chose a random question. :)

1.f) goes as follows

Because of Pythagorean rules, we can determine that

It is possible to manipulate this into a single value, by simply subtracting 1 from both sides of this equation.

And finally, we end up with a single value

Or, you could turn it into a sine and cosine ratio

Whatever floats your boat! If you have any questions or comments on how I did this, feel free to ask!

Also Code Cogs is a pretty cool math site!