What would be the equations analogous to Eqs. (2.6-24) and (2.6-25) that would result from using triangular instead of quadrilateral regions?
2. Prove that the Fourier kernels in Eqs. (2.6-34) and (2.6-35) are separable and symmetric
3. Show that 2-D transforms with separable, symmetric kernels can be computed by (1) computing 1-D transforms along the individual rows (columns) of the input, followed by (2) computing 1-D transforms along the columns (rows) of the result from step (1).