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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by Celinajy)
Hi, anyone help me with this?

For edexcel c4 textbook, chapter 4 mixed exercise 4F Q8
*The curve C has parametirc equations
X=4cos2t , y=3sint. -pie/2<t<pie/2
A is the point (2,3/2), and lies on C.
a) Find the value of t at the point A.

Here is my answer :t= 30, -30, 150,-150 (got it from solving x and y)

But the answer from the textbook and solution bank just "30"???

PLS HELP ：））
First note that -90 < t < 90 in degrees. So that means 150 and -150 can't be solutions. Also note that 3sin(-30) =/= 3/2. (remember sin(-x) = -sin(x))
2. (Original post by 13 1 20 8 42)
First note that -90 < t < 90 in degrees. So that means 150 and -150 can't be solutions. Also note that 3sin(-30) =/= 3/2. (remember sin(-x) = -sin(x))
so does that means that -30 needs to satisfy to both parametric equations, therefore it cannot be the solution because it makes -3/2??
3. (Original post by Celinajy)
so does that means that -30 needs to satisfy to both parametric equations, therefore it cannot be the solution because it makes -3/2??
Yeah, you need both x = 2 and y = 3/2 for it to be the point A.
4. What papers do you reckon are the most challenging (the best) to do apart from the normal papers. IYGB, Solomon, Gold etc.. ? (Obviously doing all of them is the best possible revision, but just wanted to know in case I'm forced to prioritize papers.
5. (Original post by 13 1 20 8 42)
Yeah, you need both x = 2 and y = 3/2 for it to be the point A.
Thanks a lot🤗
6. (Original post by Ninjakam119)
What papers do you reckon are the most challenging (the best) to do apart from the normal papers. IYGB, Solomon, Gold etc.. ? (Obviously doing all of them is the best possible revision, but just wanted to know in case I'm forced to prioritize papers.
The harder IYGB papers are the most challenging
7. (Original post by Celinajy)
Hi, anyone help me with this?

For edexcel c4 textbook, chapter 4 mixed exercise 4F Q8
*The curve C has parametirc equations
X=4cos2t , y=3sint. -pie/2<t<pie/2
A is the point (2,3/2), and lies on C.
a) Find the value of t at the point A.

Here is my answer :t= 30, -30, 150,-150 (got it from solving x and y)

But the answer from the textbook and solution bank just "30"???

PLS HELP ：））
Which of those give you the correct value for y?

And you're only interested in the range -pi/2 to pi/2.

8. I finished my 8th past paper and scored 70/75 --> 93.3% = A*. --->
I've generally been scoring 72-73/75 on average ish.

I'm really disappointed in myself as I lost 2 marks due to forgetting a " - " sign on separating the variables
and had my head and eventually gave up. I lost another mark a stupid mistake on parametric equations,
which I should have really got.

The last 2 marks I genuinely lost due to mistaking the limits on a integration part and writing something else

I feel I should have got 73/75 - 98% ums = A* but I'm happy as its the first time in a couple past papers that I've learned from my mistakes. #progress #gains
9. (Original post by Ninjakam119)
What papers do you reckon are the most challenging (the best) to do apart from the normal papers. IYGB, Solomon, Gold etc.. ? (Obviously doing all of them is the best possible revision, but just wanted to know in case I'm forced to prioritize papers.
The Gold papers etc are simply the questions from the actual papers rearranged into a different order, so you won't meet any new questions on them if you've already done the actual papers.
10. (Original post by Ninjakam119)
What papers do you reckon are the most challenging (the best) to do apart from the normal papers. IYGB, Solomon, Gold etc.. ? (Obviously doing all of them is the best possible revision, but just wanted to know in case I'm forced to prioritize papers.
The gold papers pick the hardest questions that edexcel has given and put them together.
International papers and Solomon papers are good once you've finished the normal papers.

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11. Sorry I know this is a C4 thread but can anyone help me with a C3 Q?

Given that f(x) = x^3 -5x^2 + 2, show that the equation f(x) = 0 has a root near to x = 5

Why did the answer use f(5) and f(4.9)? I thought it was something to do with lower and upper bounds
12. (Original post by KINGYusuf)
Sorry I know this is a C4 thread but can anyone help me with a C3 Q?

Given that f(x) = x^3 -5x^2 + 2, show that the equation f(x) = 0 has a root near to x = 5

Why did the answer use f(5) and f(4.9)? I thought it was something to do with lower and upper bounds
Where did you get this question from? It seems very ambigous. Anything from f(4.9) to f(5.1) or f(4.8) to f(5.2), etc... could be used. There isn't one correct answer.
13. (Original post by XxKingSniprxX)
I finished my 8th past paper and scored 70/75 --> 93.3% = A*. --->
I've generally been scoring 72-73/75 on average ish.

I'm really disappointed in myself as I lost 2 marks due to forgetting a " - " sign on separating the variables
and had my head and eventually gave up. I lost another mark a stupid mistake on parametric equations,
which I should have really got.

The last 2 marks I genuinely lost due to mistaking the limits on a integration part and writing something else

I feel I should have got 73/75 - 98% ums = A* but I'm happy as its the first time in a couple past papers that I've learned from my mistakes. #progress #gains
What paper was it? I'll have a go at it
14. (Original post by KINGYusuf)
Sorry I know this is a C4 thread but can anyone help me with a C3 Q?

Given that f(x) = x^3 -5x^2 + 2, show that the equation f(x) = 0 has a root near to x = 5

Why did the answer use f(5) and f(4.9)? I thought it was something to do with lower and upper bounds
Think upper and lower boundaries
15. (Original post by ULTRALIGHT BEAM)
What paper was it? I'll have a go at it
C4 June 2015, last year's paper I think its a secure download on Edexcels website.

I'm now gonna drop down the number of C4 pp I do to x2/week leading up to exams which would still be 8x/month -> 2.5*8 = 20 more past papers + 8 completed atm = 28 past papers.

Slowy and steady better win me the A* race
16. (Original post by XxKingSniprxX)
C4 June 2015, last year's paper I think its a secure download on Edexcels website.
It's not.
17. (Original post by Zacken)
It's not.

Finally, I can see the examiners reports = Key to success.
18. (Original post by XxKingSniprxX)

Finally, I can see the examiners reports = Key to success.
April 1st.

I've never read one before. Wouldn't exactly call it a key to success...
19. (Original post by Zacken)

I've never read one before. Wouldn't exactly call it a key to success...
Major 🔑 = Zacken

Nah but they are helpful for science subjects
20. (Original post by aymanzayedmannan)

Nah but they are helpful for science subjects
...right, I'll keep that in mind when I can work up the motivation to start...

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