The direction of nulls for end-fire array of N –Isotropic sources separated by λ/4 is given by ____

\(θ_n=sin^{-1}⁡([∓1±\frac{4n}{N}])\)

\(θ_n=cos^{-1}⁡([∓1±\frac{4n}{N}])\)

\(θ_n=sin^{-1}⁡([∓1±\frac{4n}{N}])\)

\(θ_n=cos^{-1}⁡([∓1±\frac{2n}{N}])\)

\(θ_n=cos^{-1}⁡([∓1±\frac{n}{N}])\)

The direction of nulls for end-fire array of N –Isotropic sources s

1.	The direction of nulls for end-fire array of N –Isotropic sources separated by λ/4 is given by ____
A.	\(θ_n=cos^{-1}⁡([∓1±\frac{4n}{N}])\)
B.	\(θ_n=sin^{-1}⁡([∓1±\frac{4n}{N}])\)
C.	\(θ_n=cos^{-1}⁡([∓1±\frac{2n}{N}])\)
D.	\(θ_n=cos^{-1}⁡([∓1±\frac{n}{N}])\)
Answer» B. \(θ_n=sin^{-1}⁡([∓1±\frac{4n}{N}])\)