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`

If (x)/(y) = (cos A)/( cos B) then (x tan A +y tan B)/(x +y) =

If (x)/(y)=(cos A)/(cos B)then(x tan A+y tan B)/(x+y)=cot(A+B)/(2)(b)cot(A-B)/(2)tan(A-B)/(2) (d) tan(A+B)/(2)

If (x) / (y) = (cos A) / (cos B) then (x tan A + y tan B) / (x + y) =

If (x) / (y) = (cos A) / (cos B), then (x tan A + y tan B) / (x + y) =

If (x)/(y)=(cos A)/(cos B) where A!=B ,then (a) tan(A+B)/(2)=(x tan A+y tan B)/(x+y) (b) tan(A-B)/(2)=(x tan A-y tan B)/(x+y) (c) (sin(A+B))/(sin(A-B))=(y sin A+x sin B)/(y sin A-x sin B) (d) (x cos B-y cos A)/(xcosB+ ycosA)=0

If tan A - tan B =x and cot B - cot A=y, then: cot(A-B)=

If tan A - tan B = x and cot B - cot A= y, then cot (A-B) is

If tan A - tan B = x and cot A - cot B = y, then cot( A- B) =

If tan A-tan B=x and cot B-cot A=y, then cot (A-B)=

If tan A=(x sin B)/(1-cos B)tan B=(y sin A)/(1-y cos A) then (x)/(y)=