Question

17. If (a-b)sin( A+B)=(a+b)sin ( A-B) then
tan A/tan B
1)a
2) b
3) alb
4 ) b/a​

Answer 1

let sinAcosB.cosAsinB = x

(sinAcosB+cosAsinB)=(x+1)(x-1)

use sin(A-B)=sinAcosB-cosAsinB

sin(A+B) sin(A-B) = (x+1)(x-1)

hence sin(A-B)sin(A+B)=(x-1) (x+1)

hope it help u