Question

sin(x+y) /sin(x-y) =a+b/a-b then tanx/tany =

Answer 1

we have a
$\sin( \alpha + \beta ) + \sin( \alpha - \beta ) = 2 \sin\alpha \cos \beta \\ \sin( \alpha + \beta ) - \sin( \alpha - \beta ) = 2 \cos \alpha \sin\beta$