Plz solve this problem ( Fundamentals of complex analysis

6. Let D_R be the hair disk of radius R>O centered at 0 above the real axis. Let 1"}; the halfciicle that is the boundary of D_R. Note that PH + [R, R] is the boundary of D_R. (a) use the Residue theorem to Show that frn+[_RR] $15!: = rrf2. (b) Show that MR4\