th the aid of expressions ( 15) and ( 16) in Sec. 37 for
Chapter 0, Problem 3.54(choose chapter or problem)
th the aid of expressions ( 15) and ( 16) in Sec. 37 for lsin:l 2 and lcos.::12 show that (a) I sinh .rl ::: lsi n.:: I ::: cosh y: (b) lsinhyl::: lcos.::I::: coshy.
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