I am trying to see right now how these became equivalent:
$\displaystyle \frac{1}{2}((x-a)^2+y_0^2)^-^1^/^2(2(x-a))=\frac{x-a}{\sqrt(x-a)^2+y_0^2}$
Thanks in advance...
$\displaystyle x^{-k} = \dfrac{1}{x^k}$ and $\displaystyle x^{1/n} = \sqrt[n]{x}$ (where $\displaystyle k$ is any real number and $\displaystyle n$ is a positive integer). Do you see it now?