1.
Let S={z=x+iy:∣z−1+i∣≥∣z∣, ∣z∣<2, ∣z−i∣=∣z+i∣}S = \{z = x + iy : |z - 1 + i| \ge |z|,\ |z| < 2,\ |z - i| = |z + i|\}. Then the set of all values of xx, for which w=2x+iy∈Sw = 2x + iy \in S for some y∈Ry \in \mathbb{R}, is: