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We investigate analytic continuation of the matrix cosine and sine transformsintroduced in Part I and depending on a complex parameter $\a$. It is shownthat the cosine transform corresponding to $\a=0$ is a constant multiple of theFunk-Radon transform in integral geometry for a pair of Stiefel (or Grassmann)manifolds. The same case for the sine transform gives the identity operator.These results and the relevant composition formula for the cosine transformswere established in Part I in the sense of distributions. Now we have thempointwise. Some new problems are formulated.

Funk, Cosine, and Sine Transforms on Stiefel and Grassmann manifolds, II