By accepting that the stated identity is valid when:.: is
Chapter 0, Problem 3.75(choose chapter or problem)
By accepting that the stated identity is valid when:.: is replaced by the real variable .r and using the lemma in Sec. 28. verify that (ti) cosh2 :.: - sinh2 :.: = I: (/J) sinh:.: + cosh:.: = t.r". I Compare with Exercise 4 (/)). Sec. 38. l
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