No symbolic results using HP prime

[DuxDucisH]

Hello, i recently got an HP prime which i found lovely to use. However, i've had some issues that i have no idea of solving. Searching haven't helped and im getting more and more frustrated.

I'll start of with my biggest issue right now. When differentiating equations, i seem to be unable to get an symbolic answer, instead the calculator seems to use the assigned value for the variable in question, and if it doesn't have a value it just uses "0" and gives a numerical answer to that.

Does anybody have an idea what im doing wrong? I'll Attach a screenshot so you can see what i mean. Doesn't seem to make any difference if i use the diff command or the derivate template. Ive tried using both small and large Xs but it doesnt make any difference.