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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

http://strawpoll.me/4648207
2. (Original post by ninetail9990)
its 2. while mutiplying 4 and 4 cancel out
What are you on about? dx = 2cos(theta)d(theta)

So it was root( 4cos^2(theta)) * 2cos(theta)
3. (Original post by IHateC12k14paper)
I agree. Stupid spammers.
Yeahh, 'stupid spammers'...
4. (Original post by Liquidizer)
I used radians because I thought that calculus with trig functions only worked with radians. I'm not sure if that's the right thing to do though.
Yeah that's right. You can only use radians if you differentiate or integrate trig functions.
5. (Original post by anndz3007)
How you intergrade 9^2x, i put u= 9^x
It was 3^2x sorry.
6. (Original post by ninetail9990)
its 2. while mutiplying 4 and 4 cancel out
No its 4! 2cos theta * 2 cos theta
7. Guys, radians or degrees for the differential equation?
8. (Original post by anndz3007)
How you intergrade 9^2x, i put u= 9^x
it wasnt 9 power 2x it was 3 power 2x you had to integrate!
9. (Original post by blueynuey1)

http://strawpoll.me/4648207/r
There is no need for another poll, this is the original: http://strawpoll.me/4648207/r
10. (Original post by IHateC12k14paper)

Here is the official poll for the C4 exam: http://strawpoll.me/4648207/r
well until then...... I will continue my freedom and right to post.
11. (Original post by anndz3007)
How you intergrade 9^2x, i put u= 9^x
3^x Squared is 3^2x not 9^2x

Example. 3^3 x 3^3 is 3^6 as you add indices, as you learn in core 1
12. (Original post by Iridann)
What are you on about? dx = 2cos(theta)d(theta)

So it was root( 4cos^2(theta)) * 2cos(theta)
Oh jesus christ I forgot to change the root4 outside the intergral to 2, what a moron
13. (Original post by DesignPredator)
Guys, radians or degrees for the differential equation?
used radians got 0.2 something sounds logical tho! 0.2 years thats like a few months perfect
14. (Original post by Iridann)
It was 3^2x sorry.
holy shieet, im just gonna kill myself now
15. Please one minute and vote at
http://www.thestudentroom.co.uk/show....php?t=3407637
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17. (Original post by ludmila)
Same here
Yes, I ballsed up the differentials question but hopefully I will have gained the marks everyone else lost on the the substitution. 13pi/ln3 anyone else?
18. VOTE NOW ON HOW YOU FOUND THIS EXAM!
Note: C4 JUNE 2015 UK paper ONLY!
19. I got some ridiulous answer in 8B)...
the values given to us just mind ****s you... but I think as long as you did volume under curve minus the volume of cone.. you should get atleast 3 or 4 method marks? I think it was out of 6...
20. No.

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