SOLUTION:
L.H.S. = 
= 
= 
(say) ……….(i)
Now 
= 
= 
= 
From eq. (i), L.H.S. = 
……….(ii)
Now 
= 
Expanding along third column, 
= 
= 
= 
= 
= 
From eq. (i), L.H.S. = 
= 
= R.H.S.
Using properties of determinants in , prove that:
Using properties of determinants in , prove that: