`9 cos^(2) x+sec^(2) y-6 cos x-4 sec y+5=0`
`rArr (3 cos x-1)^(2)+(sec y-2)^(2)=0`
`rArr cos x =1/3` and `sec y=2` (simultaneously)
`:.` Number of distance x in `(0, 2pi)` is 2 and number of distinct y in `(0, 2pi)` is 2.
`:.` Number of distinct ordered pairs `(x, y)=2xx2=4`