Talgat,
If you need help, you need to attach a Mathcad worksheet showing what you have tried. We are not here to do anyone's home work. But if you have a question about how to use Mathcad or something that is not working in Mathcad then you can ask that.
Please post a Mathcad worksheet showing where you are. You can click on "Use advanced editor" in the upper right corner to be able to attach a Mathcad worksheet.
Regards,
Mona
