Topics

1

MAT244--Misc / concern about the quiz6 grade

« on: November 11, 2018, 08:47:30 PM »

I wrote the quiz  during the tutorial and i receive a zero but I don't know what's going on with it. And I didn't get the feedback from the tutorial. I just wonder whether I can see the result and figure it out the problem.

2

MAT244--Misc / Ask about the test

« on: October 10, 2018, 04:06:55 PM »

Do we have to know Euler‘s method for this test ?

3

MAT244--Lectures & Home Assignments / Question about how to deal with non exact equation

« on: September 19, 2018, 11:01:15 PM »

Hi professor Ivrii, You ask everybody, not just me. V.I.
When I do this question (3x+6/y) +(x^2/y+3y/x)dy/dx = 0 , I tried to get My and Nx and after take the partial derivative. I found My is not equal to Nx and its not exact.
I just wonder how to find the intergation factor in order to make the equation exact?

4

MAT244--Lectures & Home Assignments / Last question from todays lecture

« on: September 13, 2018, 08:08:58 PM »

Hi,
I have a question from today's lecture. The initial condition equation is $y'= (x-y)/(x+y-2)$ and after a couple steps we get
$$dw/dt = (t-w+a-b)/(t+w+a-b-2) = t-w/t+w.$$
And I am confused about why you say that $a-b=0$ and $a-b-2=0$?