Pretty difficult trig proof (identity)

[iRaid]

Homework Statement

\frac{sin\theta}{1-cos\theta} - \frac{cot\theta}{1+cos\theta} = \frac{1-cos^{3}\theta}{sin^{3}\theta}

Homework Equations

Trig identities..

The Attempt at a Solution

Basically I got to:
\frac{sin\theta+(cos^{2}\theta)(sin\theta)}{sin^{2}\theta}

Homework Statement

Is that right up to there, I think not because I can't get passed this lol.

Homework Equations

The Attempt at a Solution

 

[SammyS]

That doesn't look right.

Show how you got your result so we can help you.

 

[PeterO]

Homework Statement

\frac{sin\theta}{1-cos\theta} - \frac{cot\theta}{1+cos\theta} = \frac{1-cos^{3}\theta}{sin^{3}\theta}

Homework Equations

Trig identities..

The Attempt at a Solution

Basically I got to:
\frac{sin\theta+(cos^{2}\theta)(sin\theta)}{sin^{2}\theta}

Homework Statement

Is that right up to there, I think not because I can't get passed this lol.

Homework Equations

The Attempt at a Solution

You did notice the cot function did you - or did you misread it as cos?

 

[PeterO]

I don't think you were supposed to solve the question for the Original Poster!

 

[Dr. Seafood]

>_> Oh. Well, I hope my explanation blurb thing helps so that I'm not just blatantly giving the solution without providing any real understanding.

 

[Mark44]

>_> Oh. Well, I hope my explanation blurb thing helps so that I'm not just blatantly giving the solution without providing any real understanding.

PeterO is correct. The Physics Forums rules do not permit a member to post the solution to another member's problem.

 

[iRaid]

OK, I attached the rest of my work..

 

[PeterO]

OK, I attached the rest of my work..

In your 5th line, when you took out a factor of sin(theta) in the numerator, it was not a common factor, as it was in the denominator of a couple of the terms.

 

[iRaid]

In your 5th line, when you took out a factor of sin(theta) in the numerator, it was not a common factor, as it was in the denominator of a couple of the terms.

I see now thanks, I got it. Stupid mistakes.