Question

sin (x-y)/sin(x+y)=tan x - tan y/tan x+ tan y

Answer 1

Sin (x-y)/sin(x+y)=tan x - tan y/tan x+ tan y

if x= 1 and y=1

(sin(1)= 0.017/sin(1)= 0.017) = (tan(1)=0.017/tan(1)=0.017)

1=1