Well it seems like a uniform disaster for everyone. Low grade boundaries I'm thinking - but FP2 "low" boundaries are like 68/75 for an a*

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Reply 1345

RabiesRevenant

Original post by edothero

Would be good, except that's sinhx not sinx

No not if I used Euler's relation
e^ix = cosx + isinx
e^-ix = cosx - isinx
(e^ix - e^-ix)/2 = 2isinx/2
then idk if you can do this but i took the i out of all of it to get (e^x - e^-x)/2 = sinx

Reply 1346

crashMATHS

Original post by zcy980528

someone tell me how to integrate e^2x.sinx

IBP and then you get the e^2xsinx again and have to add it to both sides and divide - very mean!

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Reply 1347

Mattematics

No complex transformations either.. Spent so long revising them too. Christ sake edexcel

Reply 1348

crashMATHS

Original post by sameenshaw

someone just told we need to use SUBSTITUTION :angry:

Nah, parts

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Reply 1349

RThornton

Question 4 Integral Solution

Question 4b

let In=e^2x*sinx

By parts twice gives

In= 0.5e^2x*sinx - 0.25e^2x*cosx - Integral of 0.25e^2x*sin x
Integral of 0.25e^2x*sin x = 0.25 InHence, 5/4 In = 0.5e^2x*sinx - 0.25e^2x*cosxTherefore In = 1/5e^2x * (2sinx - cosx)

Reply 1350

DesignPredator

**** Edexcel bastards!! FP2 is usually guaranteed 75, that was atrocious!
The tell arsey he can't do mark schemes and now they violate is in FP2.

Reply 1351

lukejoshjames

Original post by HarshaPeed

I'm probably really stupid for doing this but I kept it as costheta= 3/4 and used arcos3/4 all the way through. Lord help me.

Nah you're not that gives you the most accurate answer

Original post by zcy980528

someone tell me how to integrate e^2x.sinx

Integration by parts twice to get the integral of e^(2x)sin(x) on both sides, then you can rearrange to find the integral of e^(2x)sin(x)

Reply 1352

JakeTan

did anyone manage question 5? I couldn't get 53/480 for my final answer........

Reply 1353

RabiesRevenant

Original post by Lilylollydove7

Yes tell me. That question killed me!!

I used Euler's relation to get everything in terms of e

Reply 1354

mathath

Original post by zcy980528

someone tell me how to integrate e^2x.sinx

Use integration by parts twice and you will get I=.......-4I

(edited 7 years ago)

Reply 1355

tas1998

anyone confident about what x tends towards as t tends to infinity? I guessed infinity, anyone know???
this is question 4a or 4b I think.

Reply 1356

math42

Grade boundaries should be kind if it was very tricky. Like last year's FP3 was absurdly low.
I can spare/want to spare myself an hour of analysis revision so if anyone linked the paper I could probs do solutions. Doubt they will/can though but just putting it out there