Mathcad Symbolic Solution includes "function"?

I'm a student using Mathcad 14 to perform symbolic calculations for stability analysis problems. Basically, I'm am taking multiple derivatives of multivariable symbolic functions. When I evaluate symbolically, I find a term in the solution 'function'. I don't know what this means or what 'function' it may be replacing. Have I accidentally changed a sheet setting or something?

It is very hard to find any help on this as "function" is included in tons of Mathcad help discussions.

Thanks!