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# Official Edexcel C3 Discussion Thread watch

1. Are the solomon papers worth doing? I tried doing one and just gave up on the first question. Isn't doing the edexcel papers enough?
2. I have to get at least 95% for C3 to get an A* because there's no way I'm going to get 90%+ in C4. Everyone says it's suicide.
3. Thanks for the help guys I see now
4. Which is the hardest edexcel paper ?

I want to try it before tomorrow
5. (Original post by Pheylan)
that wasn't very simple

all you have to do is make sure the coefficient of x^2 is 1
Meh. It's simpler when actual numbers are involved (as opposed to a, b and c)
6. does any one have the c3 june 2009 mark scheme and thanks
7. (Original post by Superman_Jr)
I have to get at least 95% for C3 to get an A* because there's no way I'm going to get 90%+ in C4. Everyone says it's suicide.
I think its easier the other way around. Last year i got 88% raw marks but 79/100 UMS. Whereas C4 has lower grade boundaries and is much easier.
8. (Original post by racshot65)
Which is the hardest edexcel paper ?

I want to try it before tomorrow
According to grade boundaries, June 2006. I haven't worked it as yet. I was saving it for last, lol.

Thanks for reminding me. I'll go do it now.
9. (Original post by Anonymous0155)
I think its easier the other way around. Last year i got 88% raw marks but 79/100 UMS. Whereas C4 has lower grade boundaries and is much easier.
liesssssssssssssssss.
The C4 paper is going to be specially designed for me to fail, I can feel it.
10. (Original post by racshot65)
Which is the hardest edexcel paper ?

I want to try it before tomorrow
Jan 07 I did not like. The last question on it is icky. Try Solomons instead, they're harder, if you're looking for something challenging!
11. sorry can some wonderful person do b.c and d, rly don't get how to find the maximum value in question b:

(a) Express 3 cos θ + 4 sin θ in the form R cos(θ – α), where R and α are constants, R > 0
and 0 < α < 90°.

(b) Hence find the maximum value of 3 cos θ + 4 sin θ and the smallest positive value of
θ for which this maximum occurs.

The temperature, f (t), of a warehouse is modelled using the equation
f (t) = 10 + 3 cos(15t)° + 4 sin(15t)°,
where t is the time in hours from midday and 0 t < 24.

(c) Calculate the minimum temperature of the warehouse as given by this model.

(d) Find the value of t when this minimum temperature occurs.
12. (Original post by Doughboy)
According to grade boundaries, June 2006. I haven't worked it as yet. I was saving it for last, lol.

Thanks for reminding me. I'll go do it now.
I'm going to have to disagree with you on that - I found June 06 quite doable. I guess it was just long (a lot of parts to all 8 questions)
13. I've been doing this all day now and i feel ready. Unless they put in really awkward questions, which knowing my luck they probably will! Oh God, i'm going to fail.
14. (Original post by unamed)
I'm going to have to disagree with you on that - I found June 06 quite doable. I guess it was just long (a lot of parts to all 8 questions)
is that the one with y = (2x - 1)tan2x? if so, yeah i would've said that was the hardest out of the lot, although not terrible
15. (Original post by Inzamam99)
sorry can some wonderful person do b.c and d, rly don't get how to find the maximum value in question b:

(a) Express 3 cos θ + 4 sin θ in the form R cos(θ – α), where R and α are constants, R > 0
and 0 < α < 90°.

(b) Hence find the maximum value of 3 cos θ + 4 sin θ and the smallest positive value of
θ for which this maximum occurs.

The temperature, f (t), of a warehouse is modelled using the equation
f (t) = 10 + 3 cos(15t)° + 4 sin(15t)°,
where t is the time in hours from midday and 0 �� t < 24.

(c) Calculate the minimum temperature of the warehouse as given by this model.

(d) Find the value of t when this minimum temperature occurs.
(b) the maximum value is whatever you got for R, the smallest possible value occurs when cos(θ - a)=1, which means θ +a= 0 rearrange to find θ.

(c) you can use your Rcos formula for this, I think. and then use the same principle as (b)
16. (Original post by Pheylan)
is that the one with y = (2x - 1)tan2x? if so, yeah i would've said that was the hardest out of the lot, although not terrible
yep, that's the one! I think I'm going to sit in a corner and think about why in the world I'm different. {and do history}
17. (Original post by unamed)
yep, that's the one! I think I'm going to sit in a corner and think about why in the world I'm different. {and do history}
i lol'd
18. what do we have to write when proving a root exists in some interval, I know you have to show and write change in sign, but what else?
19. (Original post by Pheylan)
i lol'd
do not laugh at my misery. It's not easy being different! (I constantly have to differentiate! < that's my attempt at a joke)

(Original post by Kameo)
what do we have to write when proving a root exists in some interval, I know you have to show and write change in sign, but what else?
The curve is continuous. and what you've said
20. (Original post by Kameo)
what do we have to write when proving a root exists in some interval, I know you have to show and write change in sign, but what else?
something like this should suffice

"Change of sign, therefore a root lies between a and b."

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