By using one of the identities (9)and (IO) in Sec. 39 and
Chapter 0, Problem 3.77(choose chapter or problem)
By using one of the identities (9)and (IO) in Sec. 39 and then proceeding as in Exercise 15. Sec. 38. Jlnd all roots of the equation (ti) sinh:. = i: Ans. (a) (b) :. = I (b) cosh:.: = -. '") ( 211 + ~) ;ri ( 211 ~) ;r i (11 = 0. I. 2 .... ): (11 = 0. I. + 2 .... ).
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