Question

★QUESTION★
$if \: \frac{ \cos( \alpha ) }{ \cos( \beta ) } = m \: \\ and \: \frac{ \cos( \alpha ) }{ \sin( \beta ) } = n \\ then \: prove \: that \: (m {}^{2} + n {}^{2} )cos {}^{2} \beta = n {}^{2}$
★ ANSWER SHOULD BE FULL EXPLAINED★​

Answer 1

Answer:

refer to the attachment

Answer 2

Step-by-step explanation:

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