Question

If
$\frac{ \cos( \alpha ) }{ \cos( \beta ) } = m \ \:$
and
$\frac{ \cos( \alpha ) }{ \sin( \beta ) } = n \:$
prove that
$( {m}^{2} + {n}^{2} ) { \cos( \beta ) }^{2} = {n}^{2}$
​

Answer 1

Step-by-step explanation:

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