Difference between revisions of "Relationship between sech and sec"
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| − | * {{BookReference|Handbook of mathematical functions|1964|Milton Abramowitz|author2=Irene A. Stegun|prev=Relationship between csch and csc|next=Relationship between coth and cot}}: 4.5.11 | + | * {{BookReference|Handbook of mathematical functions|1964|Milton Abramowitz|author2=Irene A. Stegun|prev=Relationship between csch and csc|next=Relationship between coth and cot}}: $4.5.11$ |
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[[Category:Unproven]] | [[Category:Unproven]] | ||
Latest revision as of 19:38, 22 November 2016
Theorem
The following formula holds: $$\mathrm{sech}(z)=\sec(iz),$$ where $\mathrm{sech}$ denotes the hyperbolic secant and $\sec$ denotes the secant.
Proof
References
- 1964: Milton Abramowitz and Irene A. Stegun: Handbook of mathematical functions ... (previous) ... (next): $4.5.11$
