Posted by **Aqib** on Monday, October 3, 2011 at 12:08am.

1-cos/1+cos= 2(cosec-cot)

- trig -
**Steve**, Monday, October 3, 2011 at 10:26am
I presume you want to solve this equation for something. It would be easier if you actually wrote it with variables, coefficients, all that cool stuff.

Or is it just an identity you want to prove? If you want help, don't just toss trash over the transom.

- trig -
**Steve**, Monday, October 3, 2011 at 12:36pm
Ahh. an identity

(1-cos)/(1+cos) * (1-cos)/(1-cos)

= (1-cos)^2/(1-cos^2)

= (1 - 2cos + cos^2)/sin^2

= (1 - 2cos + 1 - sin^2)/sin^2

= ***

Hmmm. mistake?

Take x=π/4. Things don't match.

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