Plot a graf

[ptc-5283754]

Hello
I have great difficulty in drawing a graph i Mathcad 14.
When I try to plot it, I allways get the error message: "all evaluation resulted in either an error or a complex"

I would be nice if someone could find/show me how to do it..

[ptc-5283754]

The plot should be plotted within the boundary [pi;2*pi]

[Werner_E]

The Expression in parenthesis is negative. Given the exponent kappa = 1.4 - the result is komplex.

[ptc-5283754]

Thank you for your help.
I solved the problem by inserting a parenthesis.

[Werner_E]

I solved the problem by inserting a parenthesis.

Where?