Difference between revisions of "Q-cos sub q"
From specialfunctionswiki
| Line 6: | Line 6: | ||
=Properties= | =Properties= | ||
[[q-Euler formula for e sub q]]<br /> | [[q-Euler formula for e sub q]]<br /> | ||
| + | |||
| + | =External links= | ||
| + | [http://homepage.tudelft.nl/11r49/documents/as98.pdf] | ||
=References= | =References= | ||
| − | + | * {{BookReference|A Comprehensive Treatment of q-Calculus|2012|Thomas Ernst|prev=q-sin|next=}}: $(6.202)$ | |
[[Category:SpecialFunction]] | [[Category:SpecialFunction]] | ||
Revision as of 15:35, 11 July 2016
The function $\cos_q$ is defined by $$\cos_q(z)=\dfrac{e_q(iz)+e_q(-iz)}{2}=\displaystyle\sum_{k=0}^{\infty} \dfrac{(-1)^kz^{2k}}{(q;q)_{2k}},$$ 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): $(6.202)$
