So, tackling the non rad/s version (I'm an old dog & prefer to work in Frequency ...ie Hertz), I'm lookin at this...

. . . . .
Can one of you watch me walk through this?

I'm looking to get a result of 90 (I know this is true!), using these input values for the formula

F = 1539.22 (ie Hertz)

C = 0.0000000022 (capactance of the circuit)

R = 47000 (Resistance of the circuit)

4TT = 12.5663706

top line within the brackets 4TTF/RC =

**187063916.391992** (I'm not sure how many decimal places are required to get an accurate phase result!)

Ok that lower line within the brackets - do I square the whole line or just the latter 1/RC should be squared?

I suspect the latter (else some brackets would have come into play?), ok if so, then the lower line within the brackets will be

**374128784.179834** Where did that come from? minus

**93531720.3476387** =

**280597063.832195**