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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by Krollo)
You can take a positive or negative square root.

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How do you know the negative root gives you the Cartesian in the range pi<t<2pi

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2. (Original post by Medicjug)
Attachment 395521

Can someone help me with part e and also label on the t values on the graph????

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What does c mean?

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3. (Original post by lam12)
What does c mean?

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Tangents are parallel to x axis when dy/dx = 0

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4. (Original post by randlemcmurphy)
I will post my solution with working out in a little bit. On the other hand you could check out the worked solution in the Ch6 Solution Bank here. (solution on page 42)
Thanks for the solutions. However I still don't understand where the 1 comes from when simplifying the integral. I did all the partial fraction bit right and got the ln term but not the 1 which is integrated to u.
5. (Original post by Medicjug)
How do you know the negative root gives you the Cartesian in the range pi<t<2pi

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Sin and cos have different signs in ranges. I think this is what your asking.

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6. (Original post by physicsmaths)
Sin and cos have different signs in ranges. I think this is what your asking.

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I know this is a really stupid question but isn't sin2t different to sint interms of signs

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7. (Original post by Medicjug)
I know this is a really stupid question but isn't sin2t different to sint interms of signs

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Yes it is, but since you have used the identity you can then use the ranges on t to get the Signs on sint cost

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8. is anyone doing S1 edexcel
9. (Original post by Kira Yagami)
Thanks for the solutions. However I still don't understand where the 1 comes from when simplifying the integral. I did all the partial fraction bit right and got the ln term but not the 1 which is integrated to u.
I thought that might be the part you got stuck on. It is because the numerator and denominator are to the same maximum power, so before you can express it in partial fraction you need to do long division. Hope that helps you!
10. (Original post by randlemcmurphy)
I thought that might be the part you got stuck on. It is because the numerator and denominator are to the same maximum power, so before you can express it in partial fraction you need to do long division. Hope that helps you!
I completely forgot about that. Thank you very much! I appreciate your help!
11. (Original post by iman.k)
is anyone doing S1 edexcel
Yup..is there a thread for that?
12. (Original post by Kill3er)
Yup..is there a thread for that?
i have no clue i find it really hard thats why i asked
can u do probablity i find the Qs in the papers so hard
13. (Original post by iman.k)
i have no clue i find it really hard thats why i asked
can u do probablity i find the Qs in the papers so hard
I found probability hard last year but I really worked on it and managed to crack it, it was more just about properly learning it and then bugging my teacher when I didn't get it haha and eventually I saw patterns

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14. Are solomon papers generally considered harder or easier than the standard edexcel past papers?

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15. (Original post by clara16)
Are solomon papers generally considered harder or easier than the standard edexcel past papers?

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They're meant to be harder. However I did c1 solomon papers for c1 last year and found it the same as the edexcel ones
16. (Original post by Hudl)
They're meant to be harder. However I did c1 solomon papers for c1 last year and found it the same as the edexcel ones
I'm resitting c1 tomorrow to push my grade up so thats why i was doing them, ive heard some people say if you can do solomon well edexcel is a breeze. Would you agree?

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17. (Original post by clara16)
I'm resitting c1 tomorrow to push my grade up so thats why i was doing them, ive heard some people say if you can do solomon well edexcel is a breeze. Would you agree?

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I would agree.

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18. (Original post by clara16)
I'm resitting c1 tomorrow to push my grade up so thats why i was doing them, ive heard some people say if you can do solomon well edexcel is a breeze. Would you agree?

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I also agree, I did all the past papers including solomons for c1 last year to iron out my silly mistakes and certainly after doing like 4 solomon papers, I was pretty much enduring and doing it for doing sake.
19. Can someone help please? I've just done edexcel June 2007 and I got the end of question 4 wrong. You're asked to integrate this.
I can't see where I went wrong. Thanks a lot

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20. I've just seen my mistakes.

integral of 1/(2x+1) should be 1/2 ln (2x+1).

Thanks anyway lol

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