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1 vote
Tan x-1/tan x+1=1-cot x/1+cotx

1 Answer

4 votes

(\tan x-1)/(\tan x+1)=((\sin x)/(\cos x)-1)/((\sin x)/(\cos x)+1)=(\sin x-\cos x)/(\sin x+\cos x)=(1-(\cos x)/(\sin x))/(1+(\cos x)/(\sin x))=(1-\cot x)/(1+\cot x)
answered
User Jim Hudson
by
8.6k points
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