Mark the Correct alternative in the following:

If z = 1 – cos θ + i sin θ, then |z| =

Mark the Correct alternative in the following:

If s then |z| =

Mark the Correct alternative in the following:

If then |z| =

Mark the Correct alternative in the following:

If x + i y = (1 + i) (1 + 2 i) (1 + 3i), then x² + y² =

Mark the Correct alternative in the following:

If then Re (z) =