I am still working on these complex numbers. This one is giving me trouble:

Given the following:

Express R and L in terms of the constants R1, R2, C3 and C4.

We are also told that

So this last bit is obviously the clue to solving the whole thing. I worked it out:

I did lots of algebraic manipulation after that, but nothing came of it. Would somebody please give me a hand?

(I may be crap at maths, but I'm getting good at LaTeX!)

Regards,

Evanator