Nabla cosine

Let $\mathbb{T}$ be a time scale and $p \in C_{ld}$ and $-\nu p^2 \in \mathcal{R}_{\nu}$.

$${\hat{\cos}_p(t,s)}=\dfrac{\hat{e}_{ip}(t,s)+\hat{e}_{-ip}(t,s)}{2}$$

References

[1]

$\nabla$-special functions on time scales

$\nabla$-$\widehat{\cos}_p$	$\nabla$-$\widehat{\cosh}_p$	$\nabla$-$\widehat{e}_p$	$\nabla$-$h_k$	$\nabla$-$g_k$	$\nabla$-$\widehat{\sin}_p$	$\nabla$-$\widehat{\sinh}_p$