Question: If a=frac{1}{sqrt 2}+frac{i}{sqrt 2}, find the value of a5 + conjugate of a5=?
Options
A : cos? frac{3pi}{4}
B : 2 sin ?frac{5pi}{4}
C : 2 cos frac{5pi}{4}
D : cos frac{5pi}{4}
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