Prove (a) cosh 2 x sinh 2 x = 1 (b) 1 tanh 2 x

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Prove 

(a) cosh2x – sinh2x = 1 

(b) 1 – tanh2x = sech2x.

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Related Book For  answer-question

Calculus

ISBN: 9780495011606

6th Edition

Authors: James Stewart

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