Question: The direction of nulls for end-fire array of N ?Isotropic sources separated by ?/4 is given by __
Options
A : ?_n=cos^{-1}?([?1?\frac{4n}{N}])
B : ?_n=sin^{-1}?([?1?\frac{4n}{N}])
C : ?_n=cos^{-1}?([?1?\frac{2n}{N}])
D : ?_n=cos^{-1}?([?1?\frac{n}{N}])
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