k (i) Evaluate k=7 k=0 [Hint: geometric series + De Moivre] (ii) Find an upper bound for the expression 1 +2x+2 where z lies on the circle || z|| = R with R > 10. [Hint: Use Cauchy-Schwarz]

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A: If you have any questions let me know in the comment box thankyou.

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A: If you have any help please let me know in comment box thankyou.