bug#51265: 29.0.50; Calc documentation: wrong sign of calculation

[Bird]

Hello, there is a minor typo in info node '(calc) Arithmetic Tutorial',
in texi source, line 2868 of doc/misc/calc.texi

The hyperbolic cosine of -64 should be 3.1175e27 instead of -3.1175e27.
It can be seen on calc with:
C-x * c m r _64 RET H C
which gives 3.11757454041e27

Thanks!

In GNU Emacs 29.0.50 (build 2, x86_64-pc-linux-musl, X toolkit, cairo version 
1.16.0, Xaw scroll bars)
 of 2021-10-18 built on laptop
Repository revision: f3c5a1b3685debefb9c019f96992b887f6ca69f2
Repository branch: master
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