Differentiation

$\frac{2}{9} \sinh \left(\frac{2}{3}\right) \cos \left(\cosh \left(\frac{2}{3}\right)\right)$

$\sinh \left(\frac{2}{3}\right) \cos \left(\cosh \left(\frac{2}{3}\right)\right)$

$\frac{2}{9} \cos \left(\cosh \left(\frac{2}{3}\right)\right)$

$\frac{2}{9} \cosh \left(\frac{2}{3}\right) \cos \left(\sinh \left(\frac{2}{3}\right)\right)$