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If any triangle A B C, the simplified fo...

If any triangle `A B C,` the simplified form of `
(cos 2 A)/(a^(2))-(cos 2 B)/(b^(2)) ` is

A

`a^(2)-b^(2)`

B

`(1)/(a^(2)-b^(2))`

C

`(1)/(a^(2))-(1)/(b^(2))`

D

`a^(2)+b^(2)`

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