Edexcel Core 3 - 21st June 2016 AM

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Reply 420

bat_man

right lads, what weird things could be coming up.

Reply 421

QueenOfNachos

Any idea which topic the harder questions will be tested on?

Reply 422

cookiemonster15

Original post by QueenOfNachos

Any idea which topic the harder questions will be tested on?

I think they might fiddle around with the logs and exponentials a bit. Maybe also some proof questions?

I'm hoping that it's nothing like june 2013 and that the questions are doable in the time that's given.

Reply 423

cookiemonster15

Original post by QueenOfNachos

Any idea which topic the harder questions will be tested on?

No idea why my reply is on here twice..

(edited 7 years ago)

Reply 424

Pyslocke

Original post by AMarques

Hey,

Here's a nice little identity similar to the arcsin(x) + arccos(x) relation. See if you can prove it :biggrin:

. You can find it attached since tsr latex seems to be failing me...

I think I got it but I'm not sure. I may have made a mistake somewhere and I was confusing myself half the time :s-smilie:

(edited 7 years ago)

C3Problem.png5.4KB

Reply 425

JP0458B

Just did June 2014 IAL and boy did I suck at it, it was really hard and you needed 81% for an A*,

Do some recent IAL papers combine C3 and C4 in questions? Eg the June 2014 C34 paper

Posted from TSR Mobile

Reply 426

splashywill

Original post by QueenOfNachos

Any idea which topic the harder questions will be tested on?

Differentiation and trig

Reply 427

AMarques

Original post by Pyslocke

I think I got it but I'm not sure. I may have made a mistake somewhere and I was confusing myself half the time :s-smilie:

Hey,

What you did was great, well done. Here was my take for the negative x, and also an alternative approach. It's basically the same. I doubt this question will come up but interesting none the less. If there's an issue with what I posted tell me! You can find it attached.

untitled-1.pdf69.3KB

Reply 428

Pyslocke

Original post by AMarques

Very nice, thanks a lot! This seems like a much cleaner method. And yeah, if a question like this came up I think there would be an uproar xD. I would probably collapse under the pressure.

Reply 429

AMarques

Original post by Pyslocke

Very nice, thanks a lot! This seems like a much cleaner method. And yeah, if a question like this came up I think there would be an uproar xD. I would probably collapse under the pressure.

I would agree with you there, but still a gem of a question. Good luck with the rest of your exams! If you need any help feel free to ask.

Reply 430

Pablo Picasso

Sketch

y = x^2 + 5|x| - 3
y = x^2 + |5x - 3|

showing all intersections

Reply 431

metrize

Original post by Jold

Hey, I used to do this all the time. All you have to remember is rather than divide just factorise instead as if you divide by a trig function you'll be losing some solutions

Would i get all the sultions if i did this:
tan x cos 2x = 2 cos 2x
tan x cos 2x - 2 cos 2x = 0
cos 2x ( tan x - 2 ) = 0

cos 2x = 0

tan x = 2

did i do it right or did i mess up somewhere

Reply 432

Economistician

Original post by metrize

Would i get all the sultions if i did this:
tan x cos 2x = 2 cos 2x
tan x cos 2x - 2 cos 2x = 0
cos 2x ( tan x - 2 ) = 0

cos 2x = 0

tan x = 2

did i do it right or did i mess up somewhere

Its right, but you're not finished. You have to find the values of x...

Reply 433

metrize

Original post by Economistician

Its right, but you're not finished. You have to find the values of x...

yeah thats the easy part, just wanted to make sure my intermediary steps were ok

Reply 434

Jold

Original post by metrize

Would i get all the sultions if i did this:
tan x cos 2x = 2 cos 2x
tan x cos 2x - 2 cos 2x = 0
cos 2x ( tan x - 2 ) = 0

cos 2x = 0

tan x = 2

did i do it right or did i mess up somewhere

Perfect!

Reply 435

Economistician

Original post by metrize

yeah thats the easy part, just wanted to make sure my intermediary steps were ok

Oh, haha. My bad, I didn't see the part where you wrote 'would i get all the solutions if i did this'

Reply 436

Ainsleyy

Original post by metrize

Would i get all the sultions if i did this:
tan x cos 2x = 2 cos 2x
tan x cos 2x - 2 cos 2x = 0
cos 2x ( tan x - 2 ) = 0

cos 2x = 0

tan x = 2

did i do it right or did i mess up somewhere

Yeh thats perfect what I was doing was dividing by cos2x so it disappeared haha

Reply 437

elliottls97

Original post by linaxq

Has anyone tried the very hard IYGB C3 PAPERS or the AEA papers?

I tried a AEA paper after doing all of the normal edexcel papers which were pretty easy and got a Merit on the AEA on my first attempt. Not sure though how much of these papers are difficult questions that could come up or stuff that is not on the spec.
Could integrate cosec^3x come up in Core 4?