Difference between revisions of "Pythagorean identity for sinh and cosh"
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Revision as of 20:37, 15 May 2016
Theorem: The following formula holds: $$\cosh^2(z)-\sinh^2(z)=1,$$ where $\cosh$ denotes the hyperbolic cosine and $\sinh$ denotes the hyperbolic sine.
Proof: █
