In an RC circuit, how is the impedance represented as?

[R2 - (Xc)2]1/2 [R2 + (XL + Xc)2]1/2 [R2 + (Xc)2]1/2 [R2 - (XL + Xc)2]1/2

[R2 + (Xc)2]1/2

The expression for impedance in an RC circuit : Z = [R2 + (Xc)2]1/2