Can someone please explain this to me? (this is not relevant to the question in the screenshot btw) I integrated between t=-1 and t=2 to find out the area under the curve that is not the loop and then I integrated between t=-2 and t=-1 to find the area above the curve that is not the loop. how come one is not the negative value of the other? surely they are symmetrical??

Screen Shot 2018-06-21 at 10.16.23.png340.1KB

Reply 65

JXN

13

Original post by cw7600

Can anyone explain vectors for someone who has literally no idea?

Theres quite a lot. I’d recommend watching Hegarty Maths Vectors if you know absolutely nothing. Then straight after do Past Paper Vector Chapter.

Reply 66

Notnek

21

Original post by cw7600

Can anyone explain vectors for someone who has literally no idea?

I made a guide here but I'm not sure how useful it will be to you if you have no idea.

Reply 67

JakeAdam123

12

hi can someone explain how -5ln(2/3)-2ln(5/3)+5ln(5/6)+2ln(4/3)= ln(125/64)

Reply 68

yusyus

21

Original post by shahzeb__m

Do we need to know that the integral of 1/(x^2 + 1) is tan^-1 x or nah

we may need to derive the derivative of arctan but i dont think we need to know either off by heart

Reply 69

yusyus

21

Original post by 123medicine

hi can someone explain how -5ln(2/3)-2ln(5/3)+5ln(5/6)+2ln(4/3)= ln(125/64)

start by putting all of the multipliers as exponents and then use log rules of addition/subtraction to multiply/divide

Reply 70

loginrunner

19

What is the hardest edexcel C4 paper in everyone's opinion?

Reply 71

Iconic_panda

10

@Notnek could you please help me? I am really stuck. sorry to bother you

Original post by Iconic_panda

Can someone please explain this to me? (this is not relevant to the question in the screenshot btw) I integrated between t=-1 and t=2 to find out the area under the curve that is not the loop and then I integrated between t=-2 and t=-1 to find the area above the curve that is not the loop. how come one is not the negative value of the other? surely they are symmetrical??

Reply 72

Notnek

21

Original post by Iconic_panda

Can someone please explain this to me? (this is not relevant to the question in the screenshot btw) I integrated between t=-1 and t=2 to find out the area under the curve that is not the loop and then I integrated between t=-2 and t=-1 to find the area above the curve that is not the loop. how come one is not the negative value of the other? surely they are symmetrical??

Between t=-1 and t=2, x ranges from -1 to 3, which includes the loop. So I'm not sure if you're considering the correct area?

I'm also confused why you're finding this area and not the area of the loop directly.

Reply 73

username2312801

18

hey,
I find rates with differentiation quite hard ! I don't know how you would form an equation, after forming the equation i can get it. Anyone have any tips for this topic ? :frown:

Reply 74

Lawlerfhfbdj

9

Original post by nisha.sri

hey,
I find rates with differentiation quite hard ! I don't know how you would form an equation, after forming the equation i can get it. Anyone have any tips for this topic ? :frown:

Exam solutions videos on that topic really helped me out. So you can try that as well. Good luck.

Reply 75

colabottles1738

4

DO you guys think the paper tomorrow will be harder than c3?? I really need to boost my grade up

Reply 76

candol

7

Original post by nisha.sri

hey,
I find rates with differentiation quite hard ! I don't know how you would form an equation, after forming the equation i can get it. Anyone have any tips for this topic ? :frown:

Hi,
Try using the units in the question to help. So for instance if they say the flow of something is cm^3s^-1, that must be dv/dt. if it was cm squared, then that might be dA/dt etc

Reply 77

Iconic_panda

10

umm when t=-1, x=0 so I think it doesnt include the loop.
and I was just trying to integrate to see if two areas have the same magnitude, nothing to do with original question :redface:

actually never mind I doubt it would come up anyways, thanks though!

Original post by Notnek

Between t=-1 and t=2, x ranges from -1 to 3, which includes the loop. So I'm not sure if you're considering the correct area?

I'm also confused why you're finding this area and not the area of the loop directly.

(edited 5 years ago)

Reply 78

aaldabbagh1

9

How do you do part B

(edited 5 years ago)

Reply 79

Lisande

4

Please can someone help with this with steps, after bio, Chem and C3 this week my brain doesn’t want to work anymore

Find the coefficient of x^2 in the expansion of (1-x-x^2)^0.5

Edexcel A2 Mathematics: Core Mathematics C4 6666 01 - 22 June 2018 [Exam Discussion]

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you