Having problem with using ti-89 titanium solving integral problem

[xlzhsteven]

I just bought my ti-89 Ti
Please help me with this problem.
I can't get the right integral, instead I get a matrix look output.
Check the picture I attach to this post, then tell me what I should do to have the right answer.

Thank You

 

[Mech_Engineer]

My guess is that you have 'x' defined as a matrix right now. You need to clear 'x', or use a different variable.

 

[xlzhsteven]

Thank You, I don't know how to clear 'x', but I just reset my calculate, so everything works fine now.