यदि (cos x)/(cos y) = n , (sin x)/(sin y...

यदि `(cos x)/(cos y) = n , (sin x)/(sin y) = m`,हैं तो `(m^2 - n^2) sin^2 y`के बराबर क्या है ?

A

`1-n^2`

B

`1 + n^2`

C

`m^2`

D

`n^2`

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