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Question - Trigonometric Identities - Proof and Applications of the Identity

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ConceptTrigonometric Identities - Proof and Applications of the Identity  

Question

`"If "\frac{\cos \alpha }{\cos \beta }=m\text{ and }\frac{\cos \alpha }{\sin \beta }=n " show that " (m^2 + n^2 ) cos^2 β = n^2`

 

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