# Thread: need explanation!

1. ## need explanation!

Hi ALL,

In the attached equations. the author said that the first term vanishes if y tends to zero at theta=pi more rapidly than sqrt(c-x). Any explanation for what the author means?

Thanks

mopen

2. ## Re: need explanation!

Hey mopen80.

How is the epsilon related to the other variables? (In particular, the x-variable - the y-variable is known)?

3. ## Re: need explanation!

epsilon is related to x through theta.
i attached the equations again