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# Edexcel C3,C4 June 2013 Thread watch

1. Does anyone's calculator have the ability to calculate the modulus of something? (Graphic or normal)
2. (Original post by Anonymous1717)
Does anyone's calculator have the ability to calculate the modulus of something? (Graphic or normal)
Yeah the normal casio one can do it

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3. (Original post by ChelseaSam)
C4: How do you integrate cot2x? Formula book states that the integral of cotx is ln|sinx| so would it be... 0.5ln|sin2x|?
well the book says you dont need to know how to do it.

But I did this, using recognition you can spot that cos2x/sin2x = cot2x

differentiate six2x you get 0.5cos2x so in other words it follows the rule f '(x)/f(x)= ln(f(x))

just take the 0.5 out the integral sign and you end up with 0.5ln|Sin2x|
4. what is the derivative of cos(x^2) ?
5. (Original post by Baraf)
what is the derivative of cos(x^2) ?
Chain rule
Let u = x^2
y = cosu

go from there (assuming you don't want to do the 'mental' method of differentiate the outside function, rewrite the inside function and multiply through by the derivative of the inside function)
6. (Original post by wndms)
Yeah the normal casio one can do it

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I have a Casio and a Sharp - what does the button look like?!
Thanks
7. perhaps someone can help me please intergrate: 1/(X^2+1) dx, is this possible in c4

what about (sin(x)+1)^4 , using chain rule, can you do that,(without exapanding!) ?
8. Solomon paper D, C3 - the very last question is about iteration and they go up to x5 in the mark scheme, even though the question doesn't specify (the question just asks to find the value to 3sf). Is it just because if you keep pressing =, after x5 the value doesn't change to 3sf?
http://www.school-portal.co.uk/Group...urceId=3992023
9. (Original post by Anonymous1717)
Solomon paper D, C3 - the very last question is about iteration and they go up to x5 in the mark scheme, even though the question doesn't specify (the question just asks to find the value to 3sf). Is it just because if you keep pressing =, after x5 the value doesn't change to 3sf?
http://www.school-portal.co.uk/Group...urceId=3992023
pretty sure its just that
10. (Original post by m4ths/maths247)
Chain rule
Let u = x^2
y = cosu

go from there (assuming you don't want to do the 'mental' method of differentiate the outside function, rewrite the inside function and multiply through by the derivative of the inside function)
-2xsin(x^2) ?
11. How's everyone feeling about Thursday? You guys prepared??
12. (Original post by Baraf)
-2xsin(x^2) ?
yes
13. How many past papers has everyone done? I've done 16 in 6 days and am hitting around 73/75 or above consistently
14. (Original post by DenchKing1832)
How many past papers has everyone done? I've done 16 in 6 days and am hitting around 73/75 or above consistently
Done all for C3 consistently been getting 72 to 74 out of 75. C4 done most of the papers but been getting 66 to 70 out of 75... Kinda getting worried for C4 need to cut out the silly mistakes.
15. (Original post by The Guide.)
How's everyone feeling about Thursday? You guys prepared??
I think I'll be okay with C3 by Thursday, it's C4 I'm more worried about next week!! And don't even remind me of FP2 next week too D:
16. (Original post by Cosine)
I think I'll be okay with C3 by Thursday, it's C4 I'm more worried about next week!! And don't even remind me of FP2 next week too D:
God willing I'll be okay with C3 for Thursday. I hope the function questions will be kind
17. Can someone please explain how to differentiate 2ln(x/3)
I can't seem to get the right answer!
Its probably something simple but I'm just missing it.
Thank you!
18. how would you integrate sec(^2)xtan(^2)x ?

In the answer they "assumed" y=tan cubed x
but how would you check this by differentiating? how do you differentiate tan cubed x???

thanks!!! (this is for c4 btw!) any help appreciated!
19. What is the best way to study for c3
is it okay if i did mixed exercises for the first 5 chapters.
chapters and 7 the trigonometry ones, i only did examples and a couple of exercises.
The last chapter the differentiation chapter i did everything in it
it's time to do the past papers.
Is it okay if i only did examples in chapters 6 and 7 ?
20. (Original post by Myda)
Can someone please explain how to differentiate 2ln(x/3)
I can't seem to get the right answer!
Its probably something simple but I'm just missing it.
Thank you!
Lula what you do first is differentiate ln(x/3) which is 1/3 multiplied by 1 over x/3 which gives you 1/3 multiplied by x/3 (x/3 is the differential of ln bit) and then multiply by 2 which is overall 2 x 1/x which makes 2/x there you go enjoy and good luck !

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