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If (cosalpha)/(cosbeta)=m and (cosalpha)...

If `(cosalpha)/(cosbeta)=m and (cosalpha)/(sinbeta)=n`, find `(m^(2)+n^(2))cos^(2)beta`

A

`n^(2)`

B

`m^(2)`

C

mn

D

1

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A
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