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(cos2A)/(a^(2))-(cos2B)/(b^(2))=1/(a^(2)...

`(cos2A)/(a^(2))-(cos2B)/(b^(2))=1/(a^(2))-1/(b^(2))`

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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