Show that the cospectrum and the quadrature spectrum de ned in (8.7)

can be written as c12( ) = 1 2 h=

12(h)cos(h )

C12( ) =

q12( ) = 1 2 h=

12(h)sin(h )

In addition, show that c12( ) = c21( ) and q12( ) = q21( )