Prove, using the definitions of tanh and sech in terms of the exponential function, that 1 − tanh2 (x) = sech2 (x).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section: Chapter Questions
Problem 44RE
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c) Prove, using the definitions of tanh and sech in terms of the exponential function, that

1 − tanh2 (x) = sech2 (x).

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