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If cos^2 alpha - sin^2 alpha = tan^2 bet...

If `cos^2 alpha - sin^2 alpha = tan^2 beta`, then the value of `(cos^2 beta - sin^2 beta)` is____

A

`cot^2 alpha`

B

`cot^2 beta`

C

`tan^2 alpha`

D

`tan^2 beta`

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