I hope this picture is more clear: i49.tinypic.com/r8iic2.jpg

There are 4 parameters. Alpha, Beta, Yamma and the Circle with the line through.

Then a, a*, b, b*, g, g*, r and e.

These are meanings behind the letters, but there are no other links between these variables apart from those in the equations.

The question is:

Derive an equation for 'r' which does NOT contain a*, e, or r. and

Derive an equation for 'e' which does NOT contain a*, e, or r.

This is the whole chapter completed if you guys can help me with this! I have an answer for 'e', which can hopefully be checked against one of your answers but for 'r', I keep going around in circles and getting r=r, 0=0 or some equivalent statement but no expression!

I look forward to hearing your replies, thank you all!