Difference between revisions of "Q-cos sub q"
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| − | The function $\cos_q$ is defined by | + | The function $\cos_q$ is defined for $|z|<1$ by |
| − | $$\cos_q(z)=\dfrac{e_q(iz)+e_q(-iz)}{2 | + | $$\cos_q(z)=\dfrac{e_q(iz)+e_q(-iz)}{2},$$ |
where $e_q$ denotes the [[q-exponential e|$q$-exponential $e$]] and $(q;q)_{2k}$ denotes the [[q-Pochhammer|$q$-Pochhammer symbol]]. | where $e_q$ denotes the [[q-exponential e|$q$-exponential $e$]] and $(q;q)_{2k}$ denotes the [[q-Pochhammer|$q$-Pochhammer symbol]]. | ||
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=References= | =References= | ||
| − | * {{BookReference|A Comprehensive Treatment of q-Calculus|2012|Thomas Ernst|prev=q-sin|next=}}: $(6.202)$ | + | * {{BookReference|A Comprehensive Treatment of q-Calculus|2012|Thomas Ernst|prev=q-sin sub q|next=}}: $(6.202)$ |
[[Category:SpecialFunction]] | [[Category:SpecialFunction]] | ||
Latest revision as of 15:37, 11 July 2016
The function $\cos_q$ is defined for $|z|<1$ by $$\cos_q(z)=\dfrac{e_q(iz)+e_q(-iz)}{2},$$ where $e_q$ denotes the $q$-exponential $e$ and $(q;q)_{2k}$ denotes the $q$-Pochhammer symbol.
Properties
External links
References
- 2012: Thomas Ernst: A Comprehensive Treatment of q-Calculus ... (previous): $(6.202)$
