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Edexcel C4 June 2016 - Unofficial Markscheme

Pretty sure every answer is now correct. Enjoy :smile:

:smile:

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Question 8:

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(edited 7 years ago)

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agree with all

How many marks was each question?

What was 5a about?

Got everything here! :biggrin:

:biggrin:

What was question 8c?

Got the same for everything except for the vector question. I got different cos theta value and area.

For 3a, wasn't it πsin(πy) instead of πSin(0.5π) in the denominator?? Cos you were differentiating -Cos(πy)

OP

Original post by Nadia.barakat

For 3a, wasn't it πsin(πy) instead of πSin(0.5π) in the denominator?? Cos you were differentiating -Cos(πy)

Indeed - I've left the 0.5 from part b. Changing it now.

Original post by Mattematics

Unsure about 2c - I've put what I got. If I'm wrong I'll change it.

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For 5a, it was dy/dx = -5root3/16, not x

Bless up, think I agree with all the marks but probs lost one for not simplifying 6d. Did it ask for simplest form?

Original post by Mattematics

Unsure about 2c - I've put what I got. If I'm wrong I'll change it.

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I think the 0.5 in question 3a should be a y

not so sure on 7b

Werent you suppose to differiate Cos(Piy) not 0.5 Pi

I got something like x= 31+ 3Pi / 11+ Pi

I put t = -2/5 ln (x/60) ... (same thing but with t as the subject) ... how many marks was that question?

also, if I made a mistake at the start of the implicit differentiation question, getting -sin instead of +sin, how many marks will I lose out of 9? That was the only mistake I made but the whole question is wrong as a result. I am thinking I may lose 5

dont remember if i did -root 3 but i remember doing - root3 /8 and multiplying by 8 i hope i didnt write 3 alone

Original post by Mattematics

...

I think your answer to 2(c) is right :smile:

:smile:

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Original post by The_Big_E

For 5a, it was dy/dx = -5root3/16, not x

Fixed.

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Original post by olihoughtonold

I think the 0.5 in question 3a should be a y

Yep, changing now.

Original post by Mattematics

Unsure about 2c - I've put what I got. If I'm wrong I'll change it.

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For question 3 if I didn't bring pi out the front how many marks will I lose? I got b wrong aswell. Will ecf nice me or is that like -7

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