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If (cos A)/(cos B)=p,(sin A)/(sin B)=q, ...

If `(cos A)/(cos B)=p`,`(sin A)/(sin B)=q`, then `(p^2(q^2-1))/(p^2-q^2)` is equal to (A) `-cos^2 A` (B) `cos^2 B` (C) `cos^2 A` (D)`sin^2 B`

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