Special Integrating Factor?

Dick

OOOOPS. Apologies, I sent the wrong thing. You are right on the differentiation. But I still don't like the integral of x^2*cos(xy)dy. Can you check that one again. I still get x*sin(xy).

Dick Recognitions: Homework Help Science Advisor	Special Integrating Factor? OOOOPS. Apologies, I sent the wrong thing. You are right on the differentiation. But I still don't like the integral of x^2cos(xy)dy. Can you check that one again. I still get xsin(xy).