Answer :

L.H.S =


=


since = 1


= i


= -1


= -1


= i – 1 – i + 1 + i - 1……+i-1


As, all terms will get cancel out consecutively except the first two terms. so that will get remained will be the answer.


= i - 1


L.H.S = R.H.S


Hence proved.


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