Mathematics Complex Numbers

For n ∈ N, If An = cos \(\left(\frac{\pi}{2^n}\right)+i \sin \left(\frac{\pi}{2^n}\right)\), then (A1 A2 A3 A4)4 =

1
\(\frac{-1-i}{\sqrt{2}} \)
2
1
3
0
4
\(\frac{1-i}{\sqrt{2}} \)
5
Not Attempted

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