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Question: how to solve cos * cosh = 1 ?

Question:how to solve cos * cosh = 1 ?

Pi 30 Maple 18
solve
April 18 2023
0

how to solve for lamda and r in this equtaions...please help

> 

restart
> 

with(LinearAlgebra):
> 

solve(cos(lambda[i])*cosh(lambda[i]) = 1);

Warning, solutions may have been lost

  

0

 (1)
> 

evalf(%);

0.

 (2)
> 

lambda[i];

lambda[i]

 (3)
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r[i] := (cos(lambda[i])-cosh(lambda[i]))/(sin(lambda[i])-sinh(lambda[i]));

(cos(lambda[i])-cosh(lambda[i]))/(sin(lambda[i])-sinh(lambda[i]))

 (4)
> 

``

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