Question: Prove that (i) (1 + i) + (1 - i) = 2^(n/2 +1) cos (n.pai/4) (ii) ((3)^1/2+i) +((3)^1/2-i) = 2^n+1, cos.(n.pai/6)

Prove that (i) (1 + i)" + (1 - i)" = 2^(n/2

Prove that (i) (1 + i)" + (1 - i)" = 2^(n/2 +1) cos (n.pai/4) (ii) ((3)^1/2+i)" +((3)^1/2-i)" = 2^n+1, cos.(n.pai/6)

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