Need helping starting - (sorry for bad thread name)

Hi,

Sorry for the thread title i really didn't how to describe the question,

I really need help starting this off - i've been heere for ages and i'm clearly missing a trick! Pulling hair almost!

Question:

A Point R has coordinates (x, y). Let D be the distance from (0, 0) to R so that

$\displaystyle D^2 = x^2 + y^2$

R Lies on the curve $\displaystyle y = (1+ x^2)^-1$

Find the coordinates of R such that D^2 is a minimum.

Thanks in advance if you can help!!