Write the equation that describes the circle of radius 3 that is centered at \(z=2-i\) in

(a) Cartesian form (in terms of \(x\) and \(y\) );

(b) polar form (in terms of \(\theta\) and \(r\) );

(c) complex form (in terms of \(z, r\), and \(e^{i \theta}\) ).