Question :
If x1(n) and x2(n) are two real valued sequences of length N, and let x(n) be a complex valued sequence defined as x(n)=x1(n)+jx2(n), 0≤ n≤ N-1, then what is the value of x2(n)?
1. (x(n)-x*(n))/2
2. (x(n)+x*(n))/2
3. (x(n)+x*(n))/2j
4. (x(n)-x*(n))/2j
Answer :
4 - (x(n)-x*(n))/2j
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