Hey everyone. I have a worksheet that I am having some problems with. I have spent the last hour working on these three problems and I have come no where close to the answer. I was absent on the day this was taught so I am a little behind everyone else in my class. ( I tried using Latex but it was not working for me)

sin^3 x-sin^2 x-sin x+1=(-cos^3 x)(sin x-1)

cos x/ 1-sin x = sec x + tan x

(sin x)(cos x)/cos^2 x - sin ^2 x = cot x/ cot^2 x -1

All help is greatly appreciated!