Edexcel A2 C3 Mathematics 12th June 2015 Watch

This discussion is closed.
TeddyKC
Badges: 0
Rep:
?
#1721
Report 3 years ago
#1721
(Original post by paradoxicalme)
g^-1(x) and g(x) are inverse functions and so they cancel each other out, in the same way that lne = 1
Thank you!


Posted from TSR Mobile
0
Kevin De Bruyne
Badges: 21
Rep:
?
#1722
Report 3 years ago
#1722
(Original post by frozo123)
can anyone link me the June 2013 R paper? thanks!
It should be on Pearson's website.

(Original post by Nirm)
So with maximums and stuff.
When R is maximum, cos(x+a)=-1 and R is minimum, cos(x+a)=1?

Am i right?
It's not R that you need to worry about being a maximum - it's a constant. But the term Rcostheta ranges from -R to R. R is fixed, so costheta ranges from -1 to 1. When costheta is -1, Rcostheta is -R.
0
TeddyKC
Badges: 0
Rep:
?
#1723
Report 3 years ago
#1723
Could someone help with this beast of a question?
(Part b)
Name:  ImageUploadedByStudent Room1434050875.568486.jpg
Views: 596
Size:  117.5 KB


Posted from TSR Mobile
0
suyoof123
Badges: 2
Rep:
?
#1724
Report 3 years ago
#1724
(Original post by SeanFM)
It looks like you've used the product rule there. If it's (e^x)^3, then by the chain rule that would be 3(e^x)^2 * e^x, or 3(e^x)^3. That's differentiating the function of the function and multiplying by the differential of the thing inside the brackets.



It's tiny, but not 0. if e^-x = 0, then ln(-x) = ln(0) = math error, so I guess e^-x can't be 0.
So calc in a way just simplifies it?
0
Kevin De Bruyne
Badges: 21
Rep:
?
#1725
Report 3 years ago
#1725
(Original post by suyoof123)
So calc in a way just simplifies it?
I'm not quite sure what you mean.
0
hajs
Badges: 10
Rep:
?
#1726
Report 3 years ago
#1726
(Original post by TeddyKC)
Could someone help with this beast of a question?
(Part b)
Name:  ImageUploadedByStudent Room1434050875.568486.jpg
Views: 596
Size:  117.5 KB


Posted from TSR Mobile
What paper is this?
0
H1143999
Badges: 1
Rep:
?
#1727
Report 3 years ago
#1727
(Original post by RK1998)
Can anyone help me to understand how to find 2c?
As it's the inverse of f(x), the domain will be the range of f(x).. (right?) That's all I know

Posted from TSR Mobile
is the answer any real number except 2?
What paper is this
0
suyoof123
Badges: 2
Rep:
?
#1728
Report 3 years ago
#1728
(Original post by SeanFM)
I'm not quite sure what you mean.
If you type e^-100000 , the answer comes as 0.

So doesnt that mean e^x , when x is enormous in the negative direction, = 0?
0
lalalalalola
Badges: 1
Rep:
?
#1729
Report 3 years ago
#1729
everyone ready for tomorrow's exam?
0
nbofni
Badges: 3
Rep:
?
#1730
Report 3 years ago
#1730
(Original post by lalalalalola)
everyone ready for tomorrow's exam?
Hell yeah! Can't wait to finally finish c3. It's dragged sooo much.
0
nbofni
Badges: 3
Rep:
?
#1731
Report 3 years ago
#1731
(Original post by suyoof123)
If you type e^-100000 , the answer comes as 0.

So doesnt that mean e^x , when x is enormous in the negative direction, = 0?
Be careful though, it dosen't = 0. Instead, it tends to 0 (x---->0)
0
Kevin De Bruyne
Badges: 21
Rep:
?
#1732
Report 3 years ago
#1732
(Original post by suyoof123)
If you type e^-100000 , the answer comes as 0.

So doesnt that mean e^x , when x is enormous in the negative direction, = 0?
That's what your calculator displays, as it might as well be 0 but it's a tiny bit above 0.
0
lalalalalola
Badges: 1
Rep:
?
#1733
Report 3 years ago
#1733
(Original post by nbofni)
Hell yeah! Can't wait to finally finish c3. It's dragged sooo much.
and then there's c4 coming up, so scared
1
TeddyKC
Badges: 0
Rep:
?
#1734
Report 3 years ago
#1734
(Original post by hajs)
What paper is this?
It's a practice paper from the revision guide


Posted from TSR Mobile
0
H1143999
Badges: 1
Rep:
?
#1735
Report 3 years ago
#1735
(Original post by TeddyKC)
It's a practice paper from the revision guide


Posted from TSR Mobile
which revision guide?
0
AbubakarB
Badges: 1
Rep:
?
#1736
Report 3 years ago
#1736
(Original post by frozo123)
can anyone link me the June 2013 R paper? thanks!
Paper:
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

Mark scheme:
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf
1
suyoof123
Badges: 2
Rep:
?
#1737
Report 3 years ago
#1737
(Original post by nbofni)
Be careful though, it dosen't = 0. Instead, it tends to 0 (x---->0)
(Original post by SeanFM)
That's what your calculator displays, as it might as well be 0 but it's a tiny bit above 0.

Thank you both , I'm glad I finally joined TSR, people like you are life savers
0
nbofni
Badges: 3
Rep:
?
#1738
Report 3 years ago
#1738
(Original post by lalalalalola)
and then there's c4 coming up, so scared
Yeahh, I'm a bit more concerned about c4. Integration is just crazzzy. Binomials and vectors are easy, but that pesky integration.

(Not to mention rates of change!)
0
InfinityGurl
Badges: 1
Rep:
?
#1739
Report 3 years ago
#1739
Would you lose marks if you use implicit differentiation in C3?
0
TeeEm
Badges: 19
Rep:
?
#1740
Report 3 years ago
#1740
(Original post by TeeEm)
just did this question with one of my students ... (he got eaten badly)
Any takers
question with solution posted earlier (original post 1335)

well done to those who did it correctly ...
I did it with 5 of my students today, and they all got "eaten" ...
Attached files
0
X
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19
  • University of East Anglia
    Could you inspire the next generation? Find out more about becoming a Primary teacher with UEA… Postgraduate
    Sat, 27 Apr '19
  • Anglia Ruskin University
    Health, Education, Medicine and Social Care; Arts, Humanities and Social Sciences; Business and Law; Science and Engineering Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (502)
37.8%
No - but I will (102)
7.68%
No - I don't want to (91)
6.85%
No - I can't vote (<18, not in UK, etc) (633)
47.67%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise