# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#1721
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!

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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.
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3 years ago
#1723
Could someone help with this beast of a question?
(Part b)

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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?
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3 years ago
#1725
(Original post by suyoof123)
So calc in a way just simplifies it?
I'm not quite sure what you mean.
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3 years ago
#1726
(Original post by TeddyKC)
Could someone help with this beast of a question?
(Part b)

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What paper is this?
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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

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is the answer any real number except 2?
What paper is this
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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?
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3 years ago
#1729
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3 years ago
#1730
(Original post by lalalalalola)
Hell yeah! Can't wait to finally finish c3. It's dragged sooo much.
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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)
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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.
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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
3 years ago
#1734
(Original post by hajs)
What paper is this?
It's a practice paper from the revision guide

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3 years ago
#1735
(Original post by TeddyKC)
It's a practice paper from the revision guide

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which revision guide?
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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
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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
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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!)
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3 years ago
#1739
Would you lose marks if you use implicit differentiation in C3?
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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" ...
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