Messages

1

Term Test 1 / Re: Problem 2 (morning)

« on: October 23, 2019, 08:15:34 AM »

Mengyuan Wang, I think you made a mistake.
The second linear independent solution y2 should be just (x^2e^x)/2. I think it is caused by the additional c. If you do not include the c when calculating y2, your results will be right.
And the coefficients of the general solution are also wrong, c1 should be -1/2, c2 should be 1/2.

2

Quiz-2 / TUT0801 QUIZ2

« on: October 06, 2019, 03:28:59 PM »

Question: x^2y^3+x(1+y^2)y'=0.Check why it's not exact, and check why it becomes exact after multiplying an integrating factor 1/(xy^3).
Solution is in the attached file.