fig 1=
Given:
Here, Either
……….(i)
Or
[Expanding along first row]
and and
and and ……….(ii)
Therefore, from eq. (i) and (ii), either or
Given:
Here, Either
……….(i)
Or
[Expanding along first row]
and and
and and ……….(ii)
Therefore, from eq. (i) and (ii), either or