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Value of cos^2(A - B) + cos^2 B - 2 cos ...

Value of `cos^2(A - B) + cos^2 B - 2 cos (A-B) cos Acos B` is:

A

`cos^2 A`

B

`sin^2 A`

C

`tan^2 A`

D

`cot^2 A`.

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