Computing hyperbolic functions

\(sinh\,0.75\approx 0.82232\)      Set hairline to 0.75 on \(G_\theta\), read 0.822 on T.
\(tanh\,0.75\approx 0.63515\) Set hairline to 0.75 on \(G_\theta\), read 0.635 on T.
\(cosh\,0.75\approx 1.29468\) Set hairline to 0.75 on \(G_\theta\), set left index of D under hairline, read \(sech\,0.75=0.772\) opposite right index of P, set hairline to 0.772 on CI, read 1.295 on C.
or Set hairline to 0.75 on \(G_\theta\), read \(sinh\,0.75=0.822\) on T, Move 0.822 on Q, read 1.2945 on Q′.
\(cosh\,1.75\approx 2.96419\) Set hairline to 0.75 on \(G_\theta\), set right index of D under hairline, read \(sech\,1.75=0.337\) opposite left index of P, set hairline to 0.337 on CI, read 2.97 on C.
Since \(sinh\,1.75\gt 1\), the second method cannot be used.

Because the results of the trig and hyperbolic functions do not occur on the logarithmic (C/D) scales, it is not convenient to compute hyperbolic functions of complex values using this rule; to do so requires multiplying trig functions with hyperbolic functions.

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