I used x=0 and x=1 and they both lead to a=3 and b=4..

I really cant afford to lose any more marks, just realised I lost some on the differentiation for forgetting d/dx (cosx) = -sinx.

Yeah I was initially going to use 0 and 1 too but then I read x>2 and decided not to just to be safe. On second thought though, 0 and 1 works just fine too. The question just happens to specify the domain as x>2. However using x=0 and x=1 just to simplify f(x) doesn't really violate the function. I can't imagine you losing marks.

Reply 25

musicgeek2210

Original post by kprime2

Wasn't too bad
Most questions were standard.
Lots would have done 6(a) the incredibly long and tedious way.
9(b)(c) would probably have confused students.

I reckon 62ish for an A

EDIT: IGNORE THE PDF ATTACHMENT IT HAS A QUESTION MISSING

MODEL ANSWERS: https://drive.google.com/open?id=0B3xSC6XqSy7kNmlERk5GUG1DNDg

Thank you! Quick question. I idiotically differentiated the sin^2(2y) to be 8cos(2y)sin(2y) and contiuned on, getting the last answer to be 0.25cosec(4y). Do yiu have any idea how many marks would i have lost? Thank you!xx

Reply 26

metrize

For 8b i did:
3cot x = cosec^2 x - 2

Times by sin^2 x to get

3sin x cos x = 1- 2 sin^2 x
3/2(sin 2x)=cos2x
Tan 2x = 2/3

Then you can get the same solutions.

Would i lose marks for not doing quadratic formula way

Reply 27

kprime2

Original post by metrize

Yes. As a general rule of thumb, if you use a different method and still get the correct solutions, you still get full marks. The mark scheme tends to have several alternative ways of answering each question.

Reply 28

edothero

Original post by kprime2

seems fine, you get the correct answer

Also, sorry to bother, as you would imagine; my method for part C was also a little odd:

Spoiler

(edited 7 years ago)

Reply 29

DDan123

Yesssss Arse- I mean kprime is on it loool

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Reply 30

coolguy123456

Original post by kprime2

if on the last part of the last q i had -5(0.5+...), would i get 1-2 marks? The inside wasn't tidy or what it was supposed to be but i got -5 on outside and half on inside so cause of ln rules it's the same as having 5 and 2 ? (my inside wasn't correct but i showed working to get a)

Reply 31

edothero

Original post by coolguy123456

Question says a and b are integers. Probably -1

Reply 32

coolguy123456

Original post by edothero

Question says a and b are integers. Probably -1

For some reason my final answer was -5ln(1/2+.../e^1.4), how many marks would this get me?

(edited 7 years ago)

Reply 33

kprime2

Original post by edothero

Also, sorry to bother, as you would imagine; my method for part C was also a little odd:

Spoiler

Hmm I'm not sure. I think the purpose of the question is to test your skills of manipulating logs and exponentials to maintain an exact answer throughout your working, which is why they want you to show that T=a ln(b+b/e) rather than just finding the value of T. You've set b+b/e = 2.7375... and just let the calculator do the work for you. I can't answer for sure whether you would or wouldn't get marks but I reckon the examiner wants to see your skills in maintaining exactness throughout workings. Perhaps your answers will be sent to review and you will get marks. A lot of unconventional methods do get marks provided you get the right answer.

Reply 34

ImNervous

Anyone have any idea what ums 58 would be? I messed that paper up. Missed whole question 6. :frown:

Any help appreciated
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Reply 35

edothero

Original post by kprime2

Yeah I know, this was very sloppy from me. I had 5 minutes remaining so I just wanted to solve the question via brute force.
If they are as picky as they say, would you see me getting at least 2 marks?