Deriving hyperbolic identitiesa. Use the fundamental identity cosh2 x - sinh2 x = 1 to prove that 1 - tanh2 x = sech2 x.b. Derive the identity sinh 2x = 2 sinh x cosh x.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 57E
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Deriving hyperbolic identities
a. Use the fundamental identity cosh2 x - sinh2 x = 1 to prove that 1 - tanh2 x = sech2 x.
b. Derive the identity sinh 2x = 2 sinh x cosh x.

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