if `(x)/(2)=(cosA)/(cosB)` then prove that
`(x tan A+y tan B)/(x+y)=tan""(A+B)/(2)`

if (x)/(y)=(cosA)/(cosB) then prove that (x tan A+y tan B)/(x+y)=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) 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) 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

Prove that (sinA + sinB)/(cosA + cosB)= tan((A+B)/2)

Prove that : (sinA+sinB)/(cosA+cosB)= tan frac (A+B)(2) .

Prove that (sinA+sinB)/(cosA+cosB)=tan((A+B)/2)