# Core 4 help again

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#1
How do you do 3b http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf

Ahhh struggling
0
4 years ago
#2
Use this formula on this pic
Use the one which equals 2ain(A+B/2)cos(A-B/2)
0
4 years ago
#3
Say that A+B/2 is 3x. And that A-B/2 is x

Rearrange and solve
0
4 years ago
#4
Divide the left side by 2 then do what I said above, you will end up with the integral of (sinA +sinB)/2
This can then be integrated
But for now I must go
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#5
(Original post by Rexar)
Divide the left side by 2 then do what I said above, you will end up with the integral of (sinA +sinB)/2
This can then be integrated
But for now I must go
Wait this is not in specification for core 4 in aqa?
0
4 years ago
#6
(Original post by igotnomoney)
Wait this is not in specification for core 4 in aqa?
OH, well other then that idk, try using some identities. However this method is very easy, do you get this formula in AQA? If you do, I would simply learn this method
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4 years ago
#7
(Original post by igotnomoney)
How do you do 3b http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf

Ahhh struggling
Apply IBP twice. It's a similar approach to
0
4 years ago
#8
(Original post by igotnomoney)
Wait this is not in specification for core 4 in aqa?

For Edexcel these identities appear on the formula book and in textbooks but aren't mentioned in the spec, so exam questions don't require them. But you'll see them in Solomon and other harder papers.

RDKGames Do you know if this is the case for AQA also? This integral wouldn't be in an Edexcel exam, what about for AQA C4?
0
4 years ago
#9
(Original post by notnek)

For Edexcel these identities appear on the formula book and in textbooks but aren't mentioned in the spec, so exam questions don't require them. But you'll see them in Solomon and other harder papers.

RDKGames Do you know if this is the case for AQA also? This integral wouldn't be in an Edexcel exam, what about for AQA C4?
It's the same in AQA. I have never had to use any other identity other than the compound angle one for sine/cosine/tan even though they are all in the formula booklet and (I think) in the C4 book.

I doubt they'd use it unless they REALLY want to catch people out.
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