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# Edexcel A2 C3 Mathematics 12th June 2015 watch

1. (Original post by Gilo98)
does p = purchase price or is it just so constant?
2. (Original post by TeeEm)
just did this question with one of my students ... (he got eaten badly)
Any takers
I thought you were self employed at home?
3. (Original post by suyoof123)
will you have a worked solution put up?

i'll also attempt to not get eaten alive
4. Can someone please show me how to simplify sqr(1-(x2/4)).

THanks
5. (Original post by TeeEm)
just did this question with one of my students ... (he got eaten badly)
Any takers
got t as 64.8289... ?
6. Teeeeeeeeeeeem I don't understand b of this question, how does it equal zero for a vertical asymptote 😭😭

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7. (Original post by frozo123)
I thought you were self employed at home?
I am
8. (Original post by TeeEm)
Ah....'where A and p are positive constants'
9. (Original post by TeeEm)
I attempted it and got stumped also...
http://imgur.com/CiYYNVJ
Stuck here and not sure if previous parts were correct.
10. Do we have to prove the addition formulae? You can prove tan (A+B) using sin/cos but how do you prove sin (A+B) and cos (A+B)
11. (Original post by suyoof123)
I attempted it and got stumped also...
http://imgur.com/CiYYNVJ
Stuck here and not sure if previous parts were correct.
For U , this is t years after 1990, and for V it is t years after 2000, you need to alter it, other than that I have got as far as you.
12. (Original post by TeeEm)
just did this question with one of my students ... (he got eaten badly)
Any takers
I have an answer but its probably wrong

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13. I have done all the edexcel past papers, probably just gonna go through a couple topics or do a few elmwood papers for the rest of the day.
14. (Original post by randlemcmurphy)
For U , this is t years after 1990, and for V it is t years after 2000, you need to alter it, other than that I have got as far as you.
so would you equate U and V but have t in U when you equate them as 10?

maybe that would be correct.
15. (Original post by phawkins96)
how do you prove the differential of a^x as being a^x lna?
Let y=a^x
*ln both sides*
ln(y)=ln(a)^x
*bring x power down*
ln(y)=xln(a)
*differentiate with respect to x* (baring in mind you can use implicit differentiation for "ln(y)")
(1/y) dy/dx = ln(a) --------> for this you use uv'+vu' rule.
*multiply by y*
dy/dx=yln(a)
*y=a^x*
Therefore: dy/dx =(a^x)ln(a)
16. How do you do part 8e I can't quote get the answer even though it looks simple.

https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf
17. (Original post by gcsestuff)
Teeeeeeeeeeeem I don't understand b of this question, how does it equal zero for a vertical asymptote 😭😭

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when the asymptote indicates infinity the denominator must equal zero therefore se the bottom half of the fraction equal to zero and solve for x
18. (Original post by TeeEm)
just did this question with one of my students ... (he got eaten badly)
Any takers
Is it 2044?

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19. Is the answer 2029? not sure though...
20. Hardest C3 solomon paper?

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