Answer :

Given:


To prove : = 0.


L.H.S.= i-1 – i-2 + i-3 – i-4


i-4×1+3 – i-4×1+2 + i-4×1+3 – i-4×1


since = 1


= i



= -1


So,


i1 – i2 + i3 – 1


i +1 – i -1


0


L.H.S = R.H.S



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