Test the truth of the formula $\cosh ^2 x-\sinh ^2 x=1$ on a calculator you will probably find that the output changes from 1 to 0 somewhere between $x=10$ and $x=20$. Why is this? Should we conclude that the formula is false in the "real world"?
2026-03-28 01:35:26.1774661726
Testing the the truth of the hyperbolic functions on a calculator.
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