Question: Find the value ?n at which null occurs for an 8-element broadside array with spacing d.
Options
A : cos^{-1}?\frac{?n}{Nd}cos ?1 ?nNd
B : sin^{-1}?\frac{?n}{Nd}sin ?1 ?nNd
C : cos^{-1}?\frac{2?n}{Nd}cos ?1 2?nNd
D : sin^{-1}?\frac{2?n}{Nd}sin ?1 2?nNd
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