sin x + sin y / sin x - sin y = tan x+y /2 cot x-y / 2
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exapand sin x + sin y and sin x -sin y u ll get...
[2 sin(x+y/2).cos(x-y/2)]
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[ 2 cos(x+y/2).sin(x-y/2)]
simplify that u ll get ur ans
[2 sin(x+y/2).cos(x-y/2)]
__________________
[ 2 cos(x+y/2).sin(x-y/2)]
simplify that u ll get ur ans
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