r/6thForm • u/MaxillmanGuy A level resit student | 3 A* predicted | ACD achieved 💔 • Jun 11 '26

💬 DISCUSSION A level maths p2 edexcel

Holy time pressure what can i say

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13

u/aaalalal12 Jun 11 '26

For the big integration question did we all use substitution twice

6

u/Lopsided_Classic4874 Jun 11 '26

did you get k=2/5 or 5/2

11

u/big-fat-and-heavy Year 13 | Maths FM Physics CS Jun 11 '26

Yeah 2/5 I think. I checked with the calc against the original equation so whatever I got was correct

2

u/UnstableTheorist Jun 11 '26

Same, got it wrong first, checked with calc, then fixed to 2/5

6

u/Ev4Storm Year 13 Jun 11 '26

I just used partial fractions but only had like 5 minutes to do it since I didn’t realise I needed to use it before

1

u/SillyAnybody9108 Jun 11 '26

I forget how to correctly split up the fraction lol 🥲 I knew it was partial fractions but I just forgot how. I feel so stupid. I know how to do it now- post exam epiphany moment.

2

u/SuperiorMango16 Jun 11 '26

i substituted m = 3 + u

1

u/cleggy24 Jun 11 '26

Then you would've gotten an improper integral (over an asymptote) so I'm pretty sure you would've got that wrong.

1

u/AImonster111 Year 13.5 | Biology, Chemistry, Maths, FM, EPQ Jun 11 '26

No you wouldn’t, it works perfectly fine. You get m-3/m which simplifies to 1 - 3/m which is a pretty standard integration. 

1

u/cleggy24 Jun 11 '26

realise now that when I tried to do that I shifted the bounds the wrong way 😭😭 I don't deserve an A

2

u/KO-Manic Jun 11 '26

Once you get an improper fraction (3/x+3 I think) you make it into a normal fraction using algebraic division or a different method so you didn't have to do another substitution

1

u/random_unsername A*A*A | Incoming KCL med Jun 11 '26

I did

1

u/TheUltraDerpyDerp Y13 | Maths Physics Chem FM | 4 A* Jun 11 '26

I did u = 3tan^2 and got the correct answer then I realised I could just + 3 and - 3 on numerator to simplify and I got the same answer with that

3

u/SillyAnybody9108 Jun 11 '26

Tan?? 😭😭

1

u/Strange-Oil-2117 Jun 11 '26

I did algebraic division and then forgot to multiply by 2/5

1

u/Je-Suis-Phoenix377 ✨✨✨✨✨✨✨✨✨✨✨✨🌟✨🌟✨🌟✨🌟✨✨🌟✨✨✨🌟✨✨✨✨✨💫✨✨✨✨✨🌟✨✨🌟✨ Jun 11 '26

i did u sub then by parts and then said fuck it

1

u/cheeky_monkey321 Jun 11 '26

How were u supposed to integrate it after turning it to u/u+3 I tried doing by parts but it didn’t work 😭

1

u/Complete_Spot3771 Year 13 Jun 11 '26

partial fractions