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Posted: **Thu May 12, 2022 1:36 pm**

: For Any Complex Number Z Define Cos Z Leiz Te Iz Z A Recall Exercise 4 27 I If X Is A Real Number Then Cos 1 (29.47 KiB) Viewed 40 times

For any complex number z, define cos z = { leiz te-iz). Z = a (Recall Exercise 4.27(i): If x is a real number, then cos x = žleix +e-ix).] In contrast to real cosines, show that cos z > 1 is possible. (Hint: Show that if b is real, then cos(ib) cosh(b).)