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OCR MEI C3 Maths June 2015

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Reply 340

Hody421

Wait how did people get 4-ln(3) for the area underneath?

The line intersected at 1 and 4

Area of rectangle = 3 x 1 ?

Reply 341

Jim997

How did you do the arccosx = arcsinx? I got x=1/4 pie...

Reply 342

chizz1889

Original post by Lord-Febreeze

what was the formula of they function that we had to differentiate twice in q8? im sure it wasnt (x-2)²/2 as has been said earlier, although i could be wrong

Replace the 2 with an x

Reply 343

QueNNch

Did everyone remember to add "+ c" at the end of answer in question 2??

Reply 344

Mattestro

What did everyone get for the y value for the first question?

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Reply 345

Gcseboy1997

Original post by chizz1889

Will I lose a mark for saying 'x= (root2)/2' I didn't put +/- but it was only a two mark question

-root2/2 doesn't work as a solution

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Reply 346

chizz1889

Original post by QueNNch

Did everyone remember to add "+ c" at the end of answer in question 2??

Yeah although in mark schemes at c3 they usually condone omission of c

Reply 347

Mattestro

Original post by QueNNch

Did everyone remember to add "+ c" at the end of answer in question 2??

Ahh ****

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Reply 348

chizz1889

Original post by Gcseboy1997

-root2/2 doesn't work as a solution

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Oh yeah 😂😅 got 2/2 there then ☺️

Reply 349

ThatWasHard!

Original post by QueNNch

Did everyone remember to add "+ c" at the end of answer in question 2??

Wasn't it +0.5c because you multiply by a half? Help!!

Reply 350

chizz1889

Original post by ThatWasHard!

Wasn't it +0.5c because you multiply by a half? Help!!

No if you multiply c by any constant then it remains as c as c represents a constanct you don't know ☺️

Reply 351

Gcseboy1997

Original post by Jim997

How did you do the arccosx = arcsinx? I got x=1/4 pie...

arccosx= -arcsinx +1/2pi
Therefore 2arcsinx -1/2pi = 0
Therefore arcsin x= 1/4 pi
Therefore x =sin(1/4pi)
Therefore x= root2/2 :-)

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Reply 352

ThatWasHard!

Original post by chizz1889

No if you multiply c by any constant then it remains as c as c represents a constanct you don't know ☺️

Would a mark be taken off for that?

Reply 353

pilebunker

Vote on the difficulty of this paper here:http://strawpoll.me/4609673

Reply 354

chizz1889

Original post by Gcseboy1997

arccosx= -arcsinx +1/2pi
Therefore 2arcsinx -1/2pi = 0
Therefore arcsin x= 1/4 pi
Therefore x =sin(1/4pi)
Therefore x= root2/2 :-)

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Or you can do arccosx=theta=arcsinX
X=costheta=sintheta
Tantheta = 1 so theta = pi/4 x=sin(pi/4)=root2/2

Reply 355

Jim997

Original post by Gcseboy1997

arccosx= -arcsinx +1/2pi
Therefore 2arcsinx -1/2pi = 0
Therefore arcsin x= 1/4 pi
Therefore x =sin(1/4pi)
Therefore x= root2/2 :-)

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Wow we've never been taught that ...

Reply 356

Hody421

Original post by chizz1889

No if you multiply c by any constant then it remains as c as c represents a constanct you don't know ☺️

What did you get for the question where you had to calculate the area between y=1 and the curve?

Wasn't it 3 x 1? Since it intersects at 4 and 1

So 3 - Integral of the Curve

Reply 357

tuck91

i did **** in this paper. reckon i got max 50 marks. If i got 16/18 in the coursework then will that pull up the C3 grade much from the C average it says i'll get from looking at the past papers?

Reply 358

Jim997

Would I loose marks on 6 (I) for leaving the answer as x= sin(pie/6) ?

Reply 359

iAmanze

What a beautiful exam.

I ran out of time on the last question but should get marks for working out and the graph. (didnt label the intersects though but yolo)

That and arccosx = arcsinx which I had no clue about which was only 2 marks. I lost around 6 marks in that exam. Could only afford to lose 4 for the 90% A* so need to bang out on dreaded c4.

Every question in that paper was from a past paper! Loved the rates of change one!
It was literally copying and pasting from papers I've done but changing the numbers around :smile: