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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. Good luck to all!.

See you on the other-side
2. (Original post by Ocean3)
Can someone explain to me how to reflect a point in a line please?
Are we talking vectors?
eg OB = OA + 2AX
3. How would you integrate this???
4. (Original post by manlikem)
How would you integrate this???
The q is about differntiation lol

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5. (Original post by manlikem)
How would you integrate this???
partial fraction bruv
6. anyone else struggle with knowing what a trapezium or parallelogram or rhombus look like? LOL
7. (Original post by manlikem)
How would you integrate this???
dont you want to differentiate it?
8. (Original post by urz13)
Does anyone have any tips for sketching vector diagrams to make them easier to understand? Vectors are the one area I just can't seem to get my head round...
I think of the x,y,z graph, when given a vector, think of this graph and the direction to vectors are going in
9. (Original post by Ripper Phoenix)
The q is about differntiation lol

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oh yeahh sorry I think I'm losing my mind right before the exam
10. (Original post by candol)
dont you want to differentiate it?
yeahh you do sorry I think I'm losing my mind too much maths haha
11. (Original post by manlikem)
oh yeahh sorry I think I'm losing my mind right before the exam
Even if you had to integrate try integration by substitution

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12. (Original post by Ripper Phoenix)
Even if you had to integrate try integration by substitution

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yeahh I was thinking about that thought there was another method thanks!
13. off for an hour morning walk ...
I hope this C4 makes mince meat of everybody this afternoon except my 15 students
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14. How would you solve e? I did it as two separate triangles, one with acute angle 77, the other with obtuse angle 102, but the mark scheme has it as the acute angled triangle multiplied by two?? AX is 2rt6, angles 77.16 and 102.84
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15. (Original post by Ocean3)
Can someone explain to me how to reflect a point in a line please?
You are talking about vectors right? a reflection on a line means that the line connecting the vector that you want to reflect and the line is perpendicular. Also most of the times it gives you the point of intersection, so you have the mid point and one of the edges and you find the refflection. Let me know if that helped.
16. (Original post by kingaaran)
Thanks

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Wait so how do you differentiate cosec^22x?
17. how do you recognise intergration, can someone explain method of recognition for intergration
18. (Original post by sj97)
But if you solve for x you get 0.2375?
Sorry Q was 8-9x = 7.1
Everything should make sense now.
19. (Original post by Johann von Gauss)
Too much maths? How is that possible?
I've been revising since 4am all the way till now haha feel like I'm losing my mind gonna rest now and then off to my exam
20. (Original post by sj97)
Sorry, last minute question:
https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf
THen how do you integrate the cosec^2 2x bit?
cotx differentiates to -cosec2x

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