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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. Solomon paper E, Q 8b

How do I integrate that? It's trickier than I thought
2. (Original post by ThoughtIsFree)
1/2 (sin4x + sin2x) = sin3xcosx

a=4 b=2

in formula book

I was stuck for ages trying to use factor formulae no one would tell me the answer xD
well done.

(Original post by Leking9)
Solomon paper E, Q 8b

How do I integrate that? It's trickier than I thought
Stick a +1 on the numerator and take away the appropriate fraction.
3. (Original post by Leking9)
Solomon paper E, Q 8b

How do I integrate that? It's trickier than I thought
Try if it makes it clearer for you!
4. (Original post by Bustamove)
I wish I did better in C3.... I had economics uni 3 edexcel in PM the day before the C3 AM exam and got a little out of touch with C3 on the day...
I've definitely not reached the A* criteria for my offer... I can only hope to get a high A overall ums and beg them to let me in...
For real!
5. (Original post by marco cb)
If you truly dont understand CAST diagrams - spend some time to watch these two videos:
http://www.examsolutions.net/maths-r...tutorial-1.php

The first explains the cast diagram and the second explains how to use them to work out trig equations. You can probably skip through some of it ever so slightly but at the end, the videos are worth it imo if you really want to do the best in C4.
Ok i'll definitely check them out thank you for the help !!!
6. If calculating the angle in a vectors question, can you use 2 vectors into the point of intersection, or only 2 vectors out? Also what happens if you use one vector in and one out of the intersection?
7. (Original post by SeanFM)
well done.

Stick a +1 on the numerator and take away the appropriate fraction.
(Original post by Paraphilos)
Try if it makes it clearer for you!

Thanks guys!
8. What does 'integrating by recognition' mean?
9. Hard vectors question anyone
10. (Original post by Raizel)
sin3xcosx
how to go about integrating that?
You have to use the sum-to-product formula from C3
11. (Original post by ridirahman)
What does 'integrating by recognition' mean?
Probably integration by substitution; sometimes it is called 'integration by inspection'. In reality, they are all implicitly referring to integration by substitution.

Although somebody may need to clarify that for me.
12. Slightly reassuring the the last paper I've just done before I do the real thing was the Jan 2014 paper, and managed to get 98UMS.. If only tomorrow goes that well.
13. are the '13 and '14 replacement papers harder or the IAL ones? not sure which ones i should practice next
14. scared i'm gonna run out of time tomorrow! wish we had more time for c4
15. (Original post by SeanFM)
well done.

Stick a +1 on the numerator and take away the appropriate fraction.
oops quoted wrong person!

but thankyou haha
16. how do you know when to use the normal formula for volume of revolution OR the one whens it a parametric curve?
17. (Original post by joe1545)
Slightly reassuring the the last paper I've just done before I do the real thing was the Jan 2014 paper, and managed to get 98UMS.. If only tomorrow goes that well.
Was that IAL?
18. (Original post by ridirahman)
What does 'integrating by recognition' mean?

for example integrating 1/x
you recognise that lnx differentiated is 1/x
19. (Original post by Phenylethanone)
how do you know when to use the normal formula for volume of revolution OR the one whens it a parametric curve?
Well... you'll be dealing with parameters or you won't...
20. (Original post by HT12345)
If calculating the angle in a vectors question, can you use 2 vectors into the point of intersection, or only 2 vectors out? Also what happens if you use one vector in and one out of the intersection?
Yes you do have to use either both going in or both going out, if you use one going in and one going out you're finding a different angle

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