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Evaluate (i4n+1 – i4n–1)

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We have, i4n+1 – i4n–1

= i4n.i - i4n.i-1 = (i4)n.i - (i4)n.i-1 = (1) n.i - (1) n.i-1 = i - i-1

= 2i

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