SOLUTION: Hello, I need help with simplifying the expression: (1+cosα)/(1-cosα).tan^2 α/2- cos^2 α Or a picture will be better: http://i.imgur.com/HL34xFa.png Thank

Algebra ->  Trigonometry-basics -> SOLUTION: Hello, I need help with simplifying the expression: (1+cosα)/(1-cosα).tan^2 α/2- cos^2 α Or a picture will be better: http://i.imgur.com/HL34xFa.png Thank       Log On


   

Question 975715: Hello,
I need help with simplifying the expression: (1+cosα)/(1-cosα).tan^2 α/2- cos^2 α
Or a picture will be better: http://i.imgur.com/HL34xFa.png
Thank you a lot in advance.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
By identity,
tan%5E2%28alpha%2F2%29=%281-cos%28alpha%29%29%2F%281%2Bcos%28alpha%29%29
So then,