Let z =x +iy. which of the following functions are analytic in the entire complex plane? (a) fx,u)=e" (cos y - i sin ) (b) f(x,u)= e"(cos y-isin y) (c) f(x.y) =

Let z =X +iy. Which of the following functions are analytic in the entire complex plane? (a) fX,U)=e" (cos y - i sin ) (b) f(x,u)= e"(cos y-isin y) (c) f(x.y) = min {2, x + yP}