Phase and Bode Plots: Struggling to Understand High-Pass Filters

[revival]

Homework Statement

I am really struggling to understand how to draw a phase plot for circuits such as low/high-pass filters and other LCR circuits. I understand how to find the gain and use this information to make a Bode plot but when it comes to phase I just don't even know where to begin.
My notes seem to indicate some sort of equation along the lines of tan(phi)= tani^-1[tan(something) -tan(something)] but I haven't a clue what the 'somethings' are.

Homework Equations

If I take a simple high pass filter... G= jwCR/(1+jwCR).. how can I find the phase from this, help!

The Attempt at a Solution

 

[vela]

Start by expressing the numerator and denominator in polar form re^iϕ. Then you can easily find G in polar form.