Hi,

Say you had a function of:

e^((i pi)/7) e^(pi i)

And you had to find Arg(z),

I'm getting a bit lost, i'm trying to convert it into x + iy form, so i can use tan^-1(y/x) to get the final answer,

so im using e^((8 pi i )/7) = cos(8pi/7) + i sin(8pi/7)

but I can't take it down any further, any help would be appreciated, thanks.