tanh &#x2061;<!-- ⁡ --> ( x + y ) = tanh &#x2061;<!-- ⁡ --> ( z ) &#x21

vamosacaminarzi 2022-05-23 Answered
tanh ( x + y ) = tanh ( z ) x + y = z ??
Why is this true?
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Answers (1)

bideanbarrenaf5
Answered 2022-05-24 Author has 8 answers
d d x tanh ( x ) = sech 2 ( x ) > 0
So tanh ( x ) is strictly increasing, hence injective.
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