A review of integration

[THEParkerWhite]

I am unable to find the answer to a question. it says "d/dx [x^2sin(x)] is equal to..." but whatever answer I put in, the system says is wrong. this appears twice in this module, and I cant find a way around. the answer should be 2xsin(x) + x^2cos(x), but no matter how I input this answer, it always says that it is incorrect. what am I doing wrong, or is this a fault of the website?