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OCR C4 (not mei) 18th June 2013 revision

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Original post by sophiekutie
Umm I'm pretty sure it does... Using the rule cos^2(x) = (1+cos2x)/2. ?


My calculator says the answer is 0, but I'm just wondering how did you integrate the [Cos2xCos4x]?
Reply 221
Avatar for JimmyA*
JimmyA*
5
Original post by HypErTwisT
My calculator says the answer is 0, but I'm just wondering how did you integrate the [Cos2xCos4x]?

You leave cos2x as it is and for cos4x you use the cos double angle formula but replace x with 2x
Reply 222
Avatar for master y
master y
OP
12
Original post by JimmyA*
You leave cos2x as it is and for cos4x you use the cos double angle formula but replace x with 2x


How do you do Jan 2007 5ii please? i got the answer for the co-efficient to be one and did the correct things before ........ :s
Original post by JimmyA*
You leave cos2x as it is and for cos4x you use the cos double angle formula but replace x with 2x


surely then why you multiply stuff out you end up with your origional problem of integrating [2cos32x]? I might be missing something here....probably am...
Anyone got the jan 13 paper?
Reply 225
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JimmyA*
5
Original post by master y
How do you do Jan 2007 5ii please? i got the answer for the co-efficient to be one and did the correct things before ........ :s

I don't know i just attempted it and got stuck
Reply 226
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JimmyA*
5
Original post by master y
How do you do Jan 2007 5ii please? i got the answer for the co-efficient to be one and did the correct things before ........ :s

Oh i just managed it. You replace x with (x+x^3)
1+(x+x^3)+2(x+x^3)^2+14/3(x+x^3)^3
the X^3 terms are 1 and 14/3x^3 and so the answer is 17/3
Reply 227
Avatar for ArchieL
ArchieL
IMG_1553.jpgJan 2013:
Original post by ArchieL
IMG_1553.jpgJan 2013:


Thank you so much! :biggrin: but do you have the mark scheme by any chance either?
Reply 229
Avatar for Samj95
Samj95
heyy guys can someone please just go through vectors for me because the questions are all usually the same it just confuses the hell out of me:'(
Original post by HypErTwisT
My calculator says the answer is 0, but I'm just wondering how did you integrate the [Cos2xCos4x]?


Ummmm.... I THINK I used substitution u=sin(2x). But im not 100% sure on that... Can't find the bit of scrap paper I did it on :P
Reply 231
Avatar for master y
master y
OP
12
Anyone have a really hard question they can ask me?
Reply 232
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stirkee
19
Original post by master y
Anyone have a really hard question they can ask me?


what is the meaning of life?
Reply 233
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jamesaung
Original post by master y
Anyone have a really hard question they can ask me?


What is the air speed velocity of an unladen swallow?
Reply 234
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ninuzu
17
Original post by jamesaung
What is the air speed velocity of an unladen swallow?


Wait, do you mean an African or a European swallow?
Reply 235
Avatar for ninuzu
ninuzu
17
Original post by master y
Anyone have a really hard question they can ask me?


Describe what colours look like.
(edited 10 years ago)
Reply 236
Avatar for master y
master y
OP
12
Original post by stirkee
what is the meaning of life?


42.
Original post by jamesaung
What is the air speed velocity of an unladen swallow?

400ms-1

Original post by ninuzu
Describe colours.


Roygbiv.


Original post by Samj95
heyy guys can someone please just go through vectors for me because the questions are all usually the same it just confuses the hell out of me:'(

give me a vector q and ill try to help u
Reply 237
Avatar for igloo1
igloo1
how's everyone feeling? :smile:
Original post by tinkerbell_xxx
I haven't even started revising :frown:


hey me neither! #screwed
Original post by igloo1
how's everyone feeling? :smile:


Kinda meh. I only need a C in this really, but a B would be nice xD

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