511) sy2o@) . . Six(@) 
S21(@) S22(@)  S2x(@) 
Sxx(@) = (2.187) 
Sk1 Se2(M) . . Sx(@) 
511@) sy(@) . . 51K@) |[Gi@) 
S21@) . 5S2x(@) || Ga@) 
sy) = [G(@)G2@) . . . G(w)]] . | e188) 
Sk1@) sin(@) . . Sixx) JLGE@) 
gives 
Syy (@) = G'(@) Sxx(@) G* (@). (2.188 ”) 
Here G'(w) is the transpose of the vector G(w). 
Also 
Sy1(@) 511) sy2(w) .. . . S1x{@) Gi) 
S¥2 521@) 522) S2(W) G2(@) 
=| ° ; ; Mea (2.189) 
Sy) Sk1 SxQ(@) . . . - Sek) G,@) 
gives 
Syx(@) = Sxx(@)- G@). (2.189”) 
Therefore 
G(@) = sxx) - sxx), (2.190) 
or 
