If $\frac{\cos \alpha}{\cos \beta}=m,$ and $\frac{\cos \alpha}{\sin \b – InterviewSolution

1.	If $\frac{\cos \alpha}{\cos \beta}=m,$ and $\frac{\cos \alpha}{\sin \beta}=n,$ show that $\left(m^{2}+n^{2}\right) \cos ^{2} \beta=n^{2}$
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