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If (cosA)/(cosB)=n and (sinA)/(sinB)=m,t...

If `(cosA)/(cosB)=n and (sinA)/(sinB)=m,then (m^(2)-n^(2))sin^(2)B=`

A

`1-n^(2)`

B

`1+n^(2)`

C

`1-n`

D

`1+n`

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