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Edexcel A-Level Mathematics - Pure Maths 1 - 7 October 2020

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Original post by A.R2002

How did everyone answer the question with cosxCotx=cosxcot(3x+50°). I found it extremely and now I think I'll probably not get the A I need for university😔

Cot x = cot 3x + 50
And then you get like 25?

Reply 181

OreosWithoutMilk

Thats what I got. I arctanned both tanx and tan(3x 50)

Reply 182

devrajroy

Original post by Unlucki

Ahhh i have mixed feelings about that paper. It wasn't super nasty, wasn't super easy either. Up to like Q6 or 7 I found it really easy but then it got harder. That circles question threw me off a bit and the 2nd part of the trig identity question I had no idea what to do. There were some other things I wasn't sure about but yeah those 2 stood out the most

I split the the circle into two triangles and used the cosine rule to get the angles.

Reply 183

Bxrana

Do you guys want to be added to an Edexcel maths gc on insta? I can make one if you want

Reply 184

devrajroy

Original post by Uzair63

Cot x = cot 3x + 50
And then you get like 25?

Ya I got 25 but it’s a 5 mark question so idk I put that but it looks wrong.

Reply 185

thespaceship

is there a poll for this exam on how people found it?

Reply 186

OreosWithoutMilk

Original post by Bxrana

Do you guys want to be added to an Edexcel maths gc on insta? I can make one if you want

Yes please

Reply 187

devrajroy

Original post by Bxrana

Do you guys want to be added to an Edexcel maths gc on insta? I can make one if you want

Yes pls. My insta id is @devraj__aich.roy (that’s 2 underscores)

Reply 188

Bxrana

Original post by Bxrana

Do you guys want to be added to an Edexcel maths gc on insta? I can make one if you want

Original post by OreosWithoutMilk

Yes please

Pm me your insta usernames or on here if you don't mind.

Reply 189

emoanimelover1

Original post by Uzair63

That paper wasn’t too great, I ran out of time.
I struggled with the integration by parts question and had a strange answer for the balloon question.
I got like a value of 28 and then 4 for R but 28 seems too large lmao.
I think I need to practice integration for sure.
I couldn’t figure out how to integrate
6du/ u(3+u)

for this u had to use du/dx = 1/2u or what ever it was making dx = dux2u then cancel it was all fine till question 10

Reply 190

Zeshan435687445

Can somebody please make a unofficial mark scheme

Reply 191

username5315442

Original post by devrajroy

Ya I got 25 but it’s a 5 mark question so idk I put that but it looks wrong.

Don't forget the cos x = 0, so x was also 90 degrees.

Reply 192

username3300916

Original post by emoanimelover1

for this u had to use du/dx = 1/2u or what ever it was making dx = dux2u then cancel it was all fine till question 10

What was question 10?

Reply 193

Ferrari08

q1 bionomial, calm. q2 finding p by taking logs or something i got 7.17 i think. q3 vectors part a calm, part b show trapezium i lost. q 4 i think was sequences calm. q7 inequality no clue, got the line equation so maybe 1 mark there. q14 differential, part a and part c was bs. Integration q i got somehow i think and part b i got as ln 49/3 i think. Differential q i missed part a and part c showing expansion is valid, part b i got as cube root of 64000-11200t. I got the tan sec2 nonsense somehow. For the last proof i did (2p+q)(2p-q) =25 and then said they have to equal 5x5 which isnt possible. For the sequences i got sum as -80.

Reply 194

anonymousxxxxyy

the other two answers were 90 and 115.when you cancel cos, its cosx=0 which is 90and tan repeats itself every 180.

Reply 195

devrajroy

Original post by HS_1

wht did u guys put down for why k cannot equal 1? was it something to do with the sequence being periodic?

If it is 1 then all of the numbers in the sequence would be 2 and it wouldn’t have a periodic order of 3. That’s what I wrote

Reply 196

musicaholic13

Original post by Bxrana

Do you guys want to be added to an Edexcel maths gc on insta? I can make one if you want

yeah please @mature.cheddar hmu

Reply 197

emoanimelover1

it was way WAY HARDER than all the past papers they brought out stuff from like before spec i think the gradeboundaries will drop to maybe 70% i got to 10 b before running out of time so idk with that its above 60% idk if it will get me my a* in this paper tho

Reply 198

devrajroy

What did u guys get for that inequality graph thing?

Reply 199

Unlucki

Could someone explain to me a bit more in depth how to the cotcosec part b question? I was so lost, i proved it fine in part a) but had no idea what to do for b & im normally good at those questions