Tolong bantu saya untuk menjawab soal ini...yg bener tolong^_^

8) (1 + cot x)/(1 - cot x)
= (1 + (cos x)/(sin x)) / (1 - (cos x)/(sin x)) . (sin x)/(sin x)
= (sin x + cos x)/(sin x - cos x) . (1/cosx)/(1/cos x)
= ((sin x)/(cos x) + (cos x)/(cos x)) / ((sin x)/(cos x) - (cos x)/(cos x))
= (Tan x + 1)/(Tan x - 1)