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# 27/01/2010 Differential Equations (d.e) exam watch

1. Just wanna see how everyone got on with the exam 2day and what questions people did. And for qu 4 did everyone get y=5+e^(-t)*(2sin2t-5cos2t) cnt remember wat i got for x summing like x=1+e^(-t)*(7sin2t+3cos2t). ahhh actually i myt have those signs wrong but something along those lines
2. (Original post by jakebv)
Just wanna see how everyone got on with the exam 2day and what questions people did. And for qu 4 did everyone get y=5+e^(-t)*(2sin2t-5cos2t) cnt remember wat i got for x summing like x=1+e^(-t)*(7sin2t+3cos2t). ahhh actually i myt have those signs wrong but something along those lines
Yes, that is exactly what I got. Hurrah. Either we're both right or both wrong.

I didn't think it was a bad exam at all. Question 3 looked hideous, so I left that one. But if I got right all that I attempted, then that's great.
3. yeah i thought it was a gd, fair exam too. and cool thats reassuring. well i absolutely hate tangent fields and i dnt think i've ever got one right so i did qu 3 but it was gd cos every part was a show except the very last part so ino i was getting the ryt answer at least. wat did u think for the last part of qu 4 show that y>x for large t. cos i seemed to easy to be worth 4 marks. i just sed as t goes to infinety e(-t) goes to zero so the occilating part can be ignored so y roughly equaled 5 and x roughly equaled 1 and 5>1 but it didnt feel enough
4. (Original post by jakebv)
yeah i thought it was a gd, fair exam too. and cool thats reassuring. well i absolutely hate tangent fields and i dnt think i've ever got one right so i did qu 3 but it was gd cos every part was a show except the very last part so ino i was getting the ryt answer at least. wat did u think for the last part of qu 4 show that y>x for large t. cos i seemed to easy to be worth 4 marks. i just sed as t goes to infinety e(-t) goes to zero so the occilating part can be ignored so y roughly equaled 5 and x roughly equaled 1 and 5>1 but it didnt feel enough
What more could you have said?
5. i dno is that about the same as u put?
and did u got sumin like y=(0.03+0.05t)e^(-3t)+0.04sint-0.03cost for qu 1. thats prob wrong wat i put but it was in that form with those numbers'ish
6. (Original post by jakebv)
i dno is that about the same as u put?
and did u got sumin like y=(0.03+0.05t)e^(-3t)+0.04sint-0.03cost for qu 1. thats prob wrong wat i put but it was in that form with those numbers'ish
I left it in terms of 1/100 multiplied by the rest but yes.
7. If someone posts the paper I'll do the answers :P
8. yeah same but i couldnt remember the fractions and couldnt bothered to work them out. nyc i'm feeling pretty gd about that then
9. i tried to take a copy of the exam with me but they didnt let me
I left it in terms of 1/100 multiplied by the rest but yes.
did u do q3?
11. (Original post by jakebv)
did u do q3?
Hmmmm. No chance in hell. Too much mechanics for my liking.

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