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If x/y=(cos A)/(cos B)t h e n(x t a n A+...

If `x/y=(cos A)/(cos B)t h e n(x t a n A+y t a n B)/(x+y)=` `cot(A+B)/2` (b) `cot(A-B)/2` `tan(A-B)/2` (d) `tan(A+B)/2`

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