# Is anyone else finding C4 hard?Watch

9 years ago
#21
Integration isn't that bad, vectors is worse (well it was for me back then, I was like "woah what the hell is a line"...good times). It just takes a lot of practice. I guess it's hard for me to judge because by that time I was about 80% through FP2 integration, which was hell, but with enough practice C4 should be the same. Learning when to use integration by parts and when to use substitution is the next most important thing after understanding how to use them.
0
quote
9 years ago
#22
Look in the formula book.

The formula book even has the formula for intergration by parts in it.
0
quote
9 years ago
#23
i guess this is a good thread to ask what sin^3 x integrates to.

I know you have to use the cos2x identities for sin^2 x but what about sin^3?
0
quote
9 years ago
#24
Split it into then in a seperate place differentiate and see how that relates to doing the above integral.
0
quote
9 years ago
#25
Think cos3x.
0
quote
9 years ago
#26
(Original post by Seb.c)
i guess this is a good thread to ask what sin^3 x integrates to.

I know you have to use the cos2x identities for sin^2 x but what about sin^3?
clue: write sinx.sin^2(x)

I found C3 harder than C4 (neither were difficult tbh) because it took a bit longer to get to grips with trig, whereas calculus was fairly straightforward for me. If you find any areas difficult, just practice 'til you drop. That's the simplest advice
0
quote
9 years ago
#27
ISIT really that hard? ive got it in june along with m2! you lot are scaring me haha
0
quote
9 years ago
#28
(Original post by silent ninja)
clue: write sinx.sin^2(x)
Thankyou, (cheers to the 2 above too) ok that makes quite a bit more sense now, ill go and have another go.
0
quote
9 years ago
#29
(Original post by chud101)
ISIT really that hard? ive got it in june along with m2! you lot are scaring me haha
Depends on ability, but it's really just a continuation-- if you found C3 and the like okay, chances are C4 will be fine too.
0
quote
9 years ago
#30
Why do we need to learn intergration, can't computer do it?
0
quote
9 years ago
#31
Computers can be used to make estimates, of values of definite integrals, but computer need to be programmed by someone. Plus calculus has plenty of applications in degree level physics and above.
0
quote
9 years ago
#32
(Original post by Papado)
My class started C4 the other day and it seemed pretty easy, but then i looked at intergration and i can't believe its coming. we've gotten to vectors and up to there it was a piece of cake. i can't believe theres such a jump between that and intergration.

if anyone has any revision tips for C4 or anything, post em up!!

i usually just learn something with my class on Friday, go over EVERY question in that chapter in the book over the weekend, go over any quieries with my tutor on Tuesday, and start, on my own, the next chapter so that when we get into class I'm already sort of familiar with what we'll be doing next. So far this has been going pretty well, but unfortunately, intergration is imminent.

HELP
Seems OK. I think it takes a while to get used to, as it is a step up from C3.
0
quote
9 years ago
#33
Honestly, No
0
quote
9 years ago
#34
(Original post by benwellsday)
Split it into then in a seperate place differentiate and see how that relates to doing the above integral.

Errrrr ive made it sinx(1/2 - 1/2cos2x)

Then tried to use y = uv rule and kinda screwed it up completely and it looks nothing like the answer given lol. Any more hints?
0
quote
9 years ago
#35
(Original post by Seb.c)
Errrrr ive made it sinx(1/2 - 1/2cos2x)

Then tried to use y = uv rule and kinda screwed it up completely and it looks nothing like the answer given lol. Any more hints?

Integrating sin x is easy (I hope!). The other bit isn't so easy, but here's a trick
. Now if only there was some way to get 1/3 of that...
0
quote
9 years ago
#36
(Original post by benwellsday)
Now if only there was some way to get 1/3 of that...
Thats why its impossible to integrate this. I just typed it up into online intergrator and it said you can't do this.
0
quote
9 years ago
#37
Apparently, C4 papers are pretty predictable so even though the topics are hard, I think I'll be alright if I practice loads of papers.

I find C3 questions harder tbh
1
quote
9 years ago
#38
You typed it in wrong, derivatives work in a way that when a is constant. So in this case, you set a = 1/3.
0
quote
9 years ago
#39
(Original post by benwellsday)

Integrating sin x is easy (I hope!). The other bit isn't so easy, but here's a trick
. Now if only there was some way to get 1/3 of that...
ty
0
quote
9 years ago
#40
C4 wasn't too hard actually. We just finished it today (implicit differentiation was our last topic). Trust me, the integration is stupidly easy in comparison to the further maths integration we've been doing simultaneously.

If you just practise, it gets easier. Plus it helps to do a list of all the integration types, and in which order you should check it off (which is easiest for you), so that if you have a checklist, you know how to integrate everything (you don't miss out any method and get stuck).
0
quote
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Sheffield Hallam University
Thu, 13 Dec '18
• University of Buckingham
Thu, 13 Dec '18
• University of Lincoln
Mini Open Day at the Brayford Campus Undergraduate
Wed, 19 Dec '18

### Poll

Join the discussion

#### Do you like exams?

Yes (205)
18.69%
No (665)
60.62%
Not really bothered about them (227)
20.69%