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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by LearningGeek)
wow, i wouldve never got that in a million years, is it likely that edexcel would put a question like that?

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I've got like 71+ on the last few papers I've done and I've not seen anything like it. The hardest thing and most silly thing I've seen is two 8 mark questions (Two papers) where they wanted you to find the area of something between two lines (Obviously integrating gives you the area between a curve and the x axis). So you had to treat the whole stupid thing as a square and work it out separately (It took ages, basically).

I might have spotted it sooner in an exam, I've been revising all day so braindead :P It's one of those if you don't spot it - you're done - on the C2 paper I took last year I was one of the only people to spot you had to use Pythagoras twice to solve a particular question, most of my friends who got As on C2 couldn't do it and I only got 69 UMS. You either spot these dumb things or you don't. If they did ask it, it's one of those questions that would force down the 100 UMS I think to below 75.
2. (Original post by lulupixie)
I'm doing so well 😂😂😂 that will be me after C2 as I have biology the next day then chemistry the day after that! I mean seriously who plans these things I mean why?! Bring on C2 revision tomorrow and chem and bio cramming 🙈
Yayyyy, I'm happy for you haha. 😂😂Lol, same!!! *Majortastic highfive*. Oh em gee, I know right.
BRANG UT UN..Cramming is the best.😂

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3. (Original post by Columbo97)
Guys take a look here, much more active thread.
Thanks
4. Guys, does anyone have some rules for the the questions where they ask you to solve for 0 < x < 360 and they give you 3sin(x+45) = 2 (for example)

I know how to do everything except the final part sometimes I get confused. I know it's 180 - x for Sin, 360 - x for Cos and 180 + x for Tan.

But in this example you do 180 - x which is fine, then minus 45 which is also fine.

But the other answer is 360 + x minus 45, why is it 360 + x is it just because 360 - x is for Cos? is there a set of rules for this?
5. (Original post by Anon_98)
Yayyyy, I'm happy for you haha. 😂😂Lol, same!!! *Majortastic highfive*. Oh em gee, I know right.
BRANG UT UN..Cramming is the best.😂

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I crammed critics quotes for English this morning, I feel it might be the same with maths equations 😂🙈 how did you find C1?
6. Can someone tell me how to do all the stats stuff on the Casio fx-9750GII please.
7. (Original post by AJC1997)
Guys, does anyone have some rules for the the questions where they ask you to solve for 0 < x < 360 and they give you 3sin(x+45) = 2 (for example)

I know how to do everything except the final part sometimes I get confused. I know it's 180 - x for Sin, 360 - x for Cos and 180 + x for Tan.

But in this example you do 180 - x which is fine, then minus 45 which is also fine.

But the other answer is 360 + x minus 45, why is it 360 + x is it just because 360 - x is for Cos? is there a set of rules for this?
First of all, draw a graph, to understand what you're actually doing, then you can just do it anyway without thinking too much, but still draw a graph anyway! or use a cast diagram but wouldn't recommend it. okay for this question let (x+45) equal a variable then sin(variable)=2/3 then inverse sin of 2/3 equals the variable, work it out. plug into variable, subtract 45
8. (Original post by AJC1997)
Guys, does anyone have some rules for the the questions where they ask you to solve for 0 < x < 360 and they give you 3sin(x+45) = 2 (for example)

I know how to do everything except the final part sometimes I get confused. I know it's 180 - x for Sin, 360 - x for Cos and 180 + x for Tan.

But in this example you do 180 - x which is fine, then minus 45 which is also fine.

But the other answer is 360 + x minus 45, why is it 360 + x is it just because 360 - x is for Cos? is there a set of rules for this?
The way we do it is to as soon as u inverse the function, draw the CAST diagram and then u can see what the angles are and how to get to them and since u can only go one way round on CAST, then u can see how to work out the angles

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9. (Original post by lulupixie)
I crammed critics quotes for English this morning, I feel it might be the same with maths equations 😂🙈 how did you find C1?
Hahah, I think may friend may have done that exam- she found it awful. Ahhh no, hopefully not bahahah. Ah C1?.. Hm, well initially I thought it was okay but then I came onto student room and viewed Arsey's markscheme and ugh lol- the way I answered some questions just irritates me.😂What about yourself?

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10. (Original post by War-Mac)
Can someone tell me how to do all the stats stuff on the Casio fx-9750GII please.
To get to the stat table in which u can insert ur x and y values and use various functions to calculate different things, u do as follows
1-make sure ur in stat mode by pressing mode setup and selecting the stat option 2-then select the function A+BX
3-insert ur x and y values accordingly
4-then, once uv inserted all ur values, press AC-this is highly important
5-now press shift then 1 and to calculate sum select the sum option
6-and select the according function
-then repeat step 5 until ur screen is displaying the formula u require
8-now press enter and eh voila!

Hope this helps

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11. (Original post by Anon_98)
Hahah, I think may friend may have done that exam- she found it awful. Ahhh no, hopefully not bahahah. Ah C1?.. Hm, well initially I thought it was okay but then I came onto student room and viewed Arsey's markscheme and ugh lol- the way I answered some questions just irritates me.😂What about yourself?

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Same I was poodling through it without a problem, spoke to my friends and saw the unofficial mark scheme and saw how many stupid mistakes I made which could have easily got me more marks! So annoyed 😫
12. (Original post by lulupixie)
Same I was poodling through it without a problem, spoke to my friends and saw the unofficial mark scheme and saw how many stupid mistakes I made which could have easily got me more marks! So annoyed 😫
That pretty much described me haha!!- Hoping C2 will be better, what do you do as your chosen unit?

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13. Q3 I can't do it all otherwise got full marks

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14. (Original post by Myst0x)

I'm confused shouldn't it be

Perimeter of triangle - perimeter sector

When they're asking for perimeter of R
15. (Original post by Anon_98)
That pretty much described me haha!!- Hoping C2 will be better, what do you do as your chosen unit?

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Sorry I'm not sure what you mean :/ we do stats as well if that's it? I don't do mechanics or any of that stuff 😂 my friend does further maths I would be dead now if I was her 😂
16. (Original post by Supermanxxxxxx)

Q3 I can't do it all otherwise got full marks

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There is a que in the textbook very similar to this and I was confused too. I went to my maths sir and he said that they don't ask you to find the power of binomial it is a portion of C4..
17. (Original post by lulupixie)
Sorry I'm not sure what you mean :/ we do stats as well if that's it? I don't do mechanics or any of that stuff 😂 my friend does further maths I would be dead now if I was her 😂
Lol, yup that's what I meant.😂Bc I've talked to others here who do D1 too which sounds like death itself tbh. 😂
Hahah!! Further maths, oh not for me I dont think. But wooh!- I do S1 too.

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18. (Original post by Anon_98)
Lol, yup that's what I meant.������Bc I've talked to others here who do D1 too which sounds like death itself tbh. ������
Hahah!! Further maths, oh not for me I dont think. But wooh!- I do S1 too.

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Oh good 😂😂😂 sorry I just assumed everyone did stats and ignores the D1 etc 😂😂😂 I find stats easy tbh, if I could just continue with stats next year and leave the core behind I would but I don't think you can do that unfortunately 😂🙈 how do you find it? It's my last exam so I hope I will have energy left by then but I have half term to revise still 😊
19. (Original post by Myst0x)

I'm confused shouldn't it be

Perimeter of triangle - perimeter sector

When they're asking for perimeter of R
Use l=r x theta to find the ark length and the add it onto the other two sides and eh voila-u have ur perimeter

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20. ambiguous case
what the hell is that!

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