# Maths HL - Series and Differential EquationsWatch

7 years ago
#21
(Original post by alexmsf)
Just a hint, for questions asking for radius and interval of convergence, you will need to use the Ratio Test in 99% of times.

This video explains it amazingly well.
I love Patrick! I posted his site on another IB Maths thread lol. What about the other 1% though? I thought we always used the ratio test...

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#22
PatrickJMT is such a genius! I love his videos so much. Was going to post them on here :P
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7 years ago
#23
(Original post by alexmsf)
Well, I use a Casio fx-9860GII:

Search for any mode related to "Recursion" and recursive formulas:
I have attached doc with some instructions, that I had done for class.

Apparently, you don't even need to mention tha you used recursion, just create the table needed.

If you have questions, please ask, as if the guide is wrong the fault will be mine.
You can test it on a question for which you already know the answer.
You are a legend man! Thanks a lot, I really appreciate it and it will save me a lot of time in the exam! Cheers!
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7 years ago
#24
HAHAH.

I hated paper 3. and series and differential equations were a biatch to study for.
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7 years ago
#25
What are the most common tests for Series on Paper three?

Of the paper's I've done, I've only ran into the ratio test, p-series, and alternating series
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#26
(Original post by Ilya150)
What are the most common tests for Series on Paper three?

Of the papers I've done, I've only ran into the ratio test, p-series, and alternating series
I've seen some that have asked for integral...
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7 years ago
#27
Good luck for tomorrow!
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7 years ago
#28
I know this is a bit late...but for question 4 in the exam, there was a bit which said substitute y= something and show something.

But I swear there was no y in the first bit.

Am I being stupid? Did anyone do it?
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7 years ago
#29
(Original post by bluesky42)
I know this is a bit late...but for question 4 in the exam, there was a bit which said substitute y= something and show something.

But I swear there was no y in the first bit.

Am I being stupid? Did anyone do it?
I did it. It said y=x+n*(pi)

or something along these lines. If you substituted it correctly and worked out the new bounds, integral etc., you got the correct answer.
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7 years ago
#30
(Original post by alexmsf)
I did it. It said y=x+n*(pi)

or something along these lines. If you substituted it correctly and worked out the new bounds, integral etc., you got the correct answer.
But there was no y in the first bit of the question...?
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7 years ago
#31
(Original post by bluesky42)
But there was no y in the first bit of the question...?
It mentioned the substitution in the part b) of the question, I am sure of that. (How would I solve it otherwise? )
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7 years ago
#32
(Original post by alexmsf)
It mentioned the substitution in the part b) of the question, I am sure of that. (How would I solve it otherwise? )
No I mean part a) had a load of stuff with pi and I and x and you had to show something, which I did.

And then a random y appeared in part b) but there was no y in part a) so I couldn't figure out where to sub it in.

Oh well, its done now. Bit of a fail paper for me, ran out of time, still kicking myself for not integrating the thing to arctan ughhh...
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7 years ago
#33
What do you think of the questions 4 and 5? is there anyone here who managed to finish all the questions in time? especially the 4 and 5...
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7 years ago
#34
4 was ok, except for part 2
5.. no.
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7 years ago
#35
(Original post by bluesky42)
But there was no y in the first bit of the question...?
Surely the function within the integral implied a y = ?
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7 years ago
#36
Wasn't it the integral from n pi, to (n+1)pi?

I think the y = was implied

#5 was a bit*h.... I got 1, 2, and 4 right off the bat, couldn't integrate the left side for #3, and got two parts of 5.

Lol... for one of the parts for five, they asked you to find the first three parts of the McLaurin Series and then they gave it to you in the very next part

(Original post by bluesky42)
No I mean part a) had a load of stuff with pi and I and x and you had to show something, which I did.

And then a random y appeared in part b) but there was no y in part a) so I couldn't figure out where to sub it in.

Oh well, its done now. Bit of a fail paper for me, ran out of time, still kicking myself for not integrating the thing to arctan ughhh...
If you managed to get it up to the step where it needed have been integrated, you miss two or three marks at most. I think it was an 11 mark question, so an 8 or 9 isn't that bad.
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7 years ago
#37
(Original post by Kareir)
Surely the function within the integral implied a y = ?
Oh.

*feels stupid*

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7 years ago
#38
(Original post by bluesky42)
Oh.

*feels stupid*

Don't worry though, I didn't get it either.
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7 years ago
#39
(Original post by Kareir)
Don't worry though, I didn't get it either.
Haha thanks! I was kind of counting on that paper to make up for paper 1 but oh well!
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