Use ML lemma and squeeze theorem to prove this. There is another post about the same problem but it is clearly wrong. Please do not copy that solution into the answer.

This has two components: the line segment from R to R, and the arc in the upper halfplane from R to R (a. subset of a. circle centered at the origin}. We will refer be these two curves as ne and are respectively. 1. Assume that w 2 D. Prove that eiwz ljm dz = U. RDm \"1.: Z4 +1