Revision history of "Doubling identity for cosh (1)"

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  • (cur | prev) 22:54, 21 October 2017Tom (talk | contribs). . (374 bytes) (+374). . (Created page with "==Theorem== The following formula holds: $$\cosh(2z)=2\cosh^2(z)-1,$$ where $\cosh$ denotes hyperbolic cosine. ==Proof== ==References== * {{BookReference|Handbook o...")