In any triangle, (1+ cos (A-B)cos C)/(1+...

In any triangle, `(1+ cos (A-B)cos C)/(1+cos (A-C)cos B)=`

A

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

B

`(b^(2)+c ^(2))/(b ^(2)-c ^(2))`

C

`(c^(2)-a ^(2))/(a ^(2)+b^(2))`

D

None of these

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