((k*(2*x)-(2*x))/(2*k*(2*x)-k-1))*0.5, x from 0 to 0.5, k from -1 to 1

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.