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### Messages - JUNJING FAN

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##### Home Assignment 3 / Re: S2.3 Problem 8
« on: February 05, 2019, 07:57:09 PM »
Find the general solution and then plug to initial conditions
Hello professor, could u give me a hint as to why we have to impose the restriction for absolute value of x to be smaller or equal to 1?

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##### Home Assignment 2 / Re: problem 5 (23)
« on: January 27, 2019, 07:47:30 PM »
There is NO root. You need to parametrize before integration

but, when we parametrize Y in terms of X, don't we have to use $$y^2+x^2=C$$
and thus $$y= +/- \sqrt{C-x^2}$$?

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##### Home Assignment 2 / Need help with S2.2 P1 #4
« on: January 27, 2019, 03:13:52 PM »
I have attached my attempt. However I'm having trouble solving the problem fully with the initial condition provided. Anyone knows how to do it? Or did I make any mistakes along the way?
Thanks.

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##### Home Assignment 2 / Re: problem 5 (23)
« on: January 27, 2019, 12:11:13 PM »
Heller professor
By parametrizing Y in terms of X, do we need to put a plus/minus sign in front of the root? If yes, does that mean when we put down the final solution, we need to include plus and minus as well?

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##### Home Assignment 1 / Re: Home Assignment 1
« on: January 16, 2019, 05:07:33 PM »
Junjing, you are right but I am not sure if anyone but me would be able to read your solution
Okay. Next time I will make it 'skinnier'. Sorry.

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##### Home Assignment 1 / Re: Home Assignment 1
« on: January 16, 2019, 04:36:55 PM »
Not sure if this will work

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