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Current Year 12 Thread Mark I (2012-2013)

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Reply 7520

justinawe

Original post by L'Evil Fish

I differentiated the second bits randomly xF

My Username is really Poisson Distribution :mmm:

Think it should be

\pi \left[ \frac{x^3}{3} + 4x^{\frac{3}{2}} + 9\ln x \right]_1^4

Reply 7521

L'Evil Fish

Original post by justinawe

Think it should be

\pi \left[ \frac{x^3}{3} + 4x^{\frac{3}{2}} + 9\ln x \right]_1^4

Yeah I have that now! :biggrin:

(in the edit)

My Username is really Poisson Distribution :mmm:

Reply 7522

justinawe

Original post by L'Evil Fish

Yeah I have that now! :biggrin:

(in the edit)

My Username is really Poisson Distribution :mmm:

Good

reading that was a massive pain... I read it wrong at first and got a completely different answer! Learn LaTeX please :tongue:

Reply 7523

L'Evil Fish

Original post by justinawe

Good

reading that was a massive pain... I read it wrong at first and got a completely different answer! Learn LaTeX please :tongue:

sorry

Okay, how do I latex fractions...

Do I have to type in, frac?
And how about Integral sign? And limits? :tongue:

My Username is really Poisson Distribution :mmm:

Reply 7524

L'Evil Fish

Spoiler

Oh I give up with latex...

(3x+1) + (1/2)e^2x - *integrate* (1/2)e^2x + 3 dx

Numbers in wrong?

Lol, made that up, did that come up in latex!? :s-smilie:

My Username is really Poisson Distribution :mmm:

(edited 11 years ago)

Reply 7525

Deziah

All I can see is maths I don't understand. :eek:

What module is all this?

Reply 7526

usycool1

Original post by Deziah

All I can see is maths I don't understand. :eek:

What module is all this?

Volumes of revolution is C4 if you're with Edexcel (not sure about other exam boards though). :smile:

Reply 7527

L'Evil Fish

Original post by usycool1

Volumes of revolution is C4 if you're with Edexcel (not sure about other exam boards though). :smile:

I need Latex tutorials :colonhash:

lol, it's C4 with me as well :smile:

My Username is really Poisson Distribution :mmm:

Reply 7528

Zeionic

Original post by Deziah

All I can see is maths I don't understand. :eek:

What module is all this?

No idea, I believe it's C4 ( From what Usycool said )....This looks hard... :s-smilie:

Spoiler

(edited 11 years ago)

Reply 7529

L'Evil Fish

Original post by Sheel1

No idea, I believe it's C4 ( From what Usycool said )....This looks hard... :s-smilie:

When you learn it, it'll be fine :smile:

Integration (simple start, is opposite of differentiation) so you add one to the power and divide the co efficient by it.

If you differentiate 3x^2 + 4x + 1 you'd get 6x + 4.

If you integrate 6x + 4. You'd get 3x^2 + 4x + c (because c could be any number, we don't know it's 1)

Think of it as anti differentiation, and you can use it to find area under a graph, volume of 3D shapes :smile:

My Username is really Poisson Distribution :mmm:

Reply 7530

L'Evil Fish

Original post by Sheel1

No idea, I believe it's C4 ( From what Usycool said )....This looks hard... :s-smilie:

Spoiler

It's a rule :smile:

To find the volume generated by a graph being rotated 360 degrees. You integrate the graph squared and multiply it by Pi

Eg y = x spin it around 360 degrees, what's the.volume between 1 and 2.

square y and you get x^2 right? So integrate that and do things (you'll learn soon) and multiply by pi!

My Username is really Poisson Distribution :mmm:

(edited 11 years ago)

Reply 7531

usycool1

Original post by Sheel1

No idea, I believe it's C4 ( From what Usycool said )....This looks hard... :s-smilie:

Spoiler

Have you done C2 yet? If not, it'll be hard to explain where the pi comes from. :tongue:

Original post by L'Evil Fish

I need Latex tutorials :colonhash:

lol, it's C4 with me as well :smile:

My Username is really Poisson Distribution :mmm:

This is quite useful: http://www.thestudentroom.co.uk/wiki/LaTex :smile:

Reply 7532

justinawe

Original post by L'Evil Fish

Spoiler

Oh I give up with latex...

(3x+1) + (1/2)e^2x - *integrate* (1/2)e^2x + 3 dx

Numbers in wrong?

Lol, made that up, did that come up in latex!? :s-smilie:

My Username is really Poisson Distribution :mmm:

it's \int, not /int

Just read the article http://www.thestudentroom.co.uk/wiki/LaTex

When I was first learning how to use it, I kept referring to the article on how to do stuff. Now it just comes naturally :biggrin:

Reply 7533

L'Evil Fish

Original post by justinawe

Just read it :colonhash:

were the answers right? For integration by parts?

\int(3x+1)(e^{2x})dx

(3x+1)[(e^{2x})/2]-\int[\frac{e^{2x}}{2} + 3] dx

[\frac{(3x)(e^{2x}) + e^{2x}}{2}] - \frac{e^{2x}}{4} + 3x

trying my new skillz
My Username is really Poisson Distribution :mmm:

(edited 11 years ago)

Reply 7534

justinawe

Original post by L'Evil Fish

Just read it :colonhash:

were the answers right? For integration by parts?

\int(3x+1)(e^{2x})dx

My Username is really Poisson Distribution :mmm:

I don't see no answers :colonhash:

Reply 7535

L'Evil Fish

Original post by justinawe

I don't see no answers :colonhash:

Oops, check last post on previous page, the bottom one :tongue:

My Username is really Poisson Distribution :mmm:

Reply 7536

justinawe

Original post by L'Evil Fish

Just read it :colonhash:

were the answers right? For integration by parts?

\int(3x+1)(e^{2x})dx

(3x+1)[(e^{2x})/2]-\int[\frac{e^{2x}}{2} + 3] dx

[\frac{(3x)(e^{2x}) + e^{2x}}{2}] - \frac{e^{2x}}{4} + 3x

trying my new skillz
My Username is really Poisson Distribution :mmm:

Is that the same as

\frac{1}{4}e^{2x}(6x-1)+c

cause that's what I got :tongue:

Reply 7537

L'Evil Fish

Original post by justinawe

Is that the same as

\frac{1}{4}e^{2x}(6x-1)+c

cause that's what I got :tongue:

Let me see :colone:

It probably is :tongue:

because I got something like that in my head :colonhash:

Latex is hurting me now :tongue:

My Username is really Poisson Distribution :mmm:

(edited 11 years ago)

Reply 7538

justinawe

Original post by L'Evil Fish

(3x+1)[(e^{2x})/2]-\int[\frac{e^{2x}}{2} + 3] dx

The second one should be

\int[\frac{e^{2x}}{2}(3)] dx

multiply not add :colone:

Reply 7539

Robbie242

I feel so stupid for failing the coordinate geometry test now! and I think they will use it for my predicted AS grades >_< It's even more simple than the series assignment I did -4/-5 and said it was -4/5 >_< stupid positive negative mistakes! Just did the whole test again in 10minutes without any help and got 100%! but I guess stuff happens