How was Additional Mathematics Paper 1?

[kim anika]

you did the 12 variant right? the 2nd differentiation question:

(4 - tan 2x)/5x

dy/dx = ?

oh my exam will start after 1hr 45 min
i m v1

 

[Skyrior]

oh my exam will start after 1hr 45 min
i m v1

ok thx...
it's super hard for me anyways...

 

[fcbayernmunchen]

for differentiation of the tan x thing:

4 - tan 2x
-----------
5x

...................who can do it?

Well I'm pretty sure it the tangent's differential was -2sec²2x ! The rest could be handled by the ( u/v ) technique.

 

[Skyrior]

Well I'm pretty sure it the tangent's differential was -2sec²2x ! The rest could be handled by the ( u/v ) technique.

....relieved at last...

 

[fcbayernmunchen]

In Shah Allah u will nail...nw pray for me so dat i can nail in p1

Best of Luck. It will turn out to be good insha Allah.

 

[fcbayernmunchen]

I don't remember the exact question, but were you guys getting a value around 4800 for 'N' ?

 

[Skyrior]

I don't remember the exact question, but were you guys getting a value around 4800 for 'N' ?

4700, exact figure...

 

[fcbayernmunchen]

4700, exact figure...

oh yeaah B) Gotcha.

 

[Chucky]

variant 2 was more or less easy, made a few minor mistakes that probably lost me about 5 marks maximum.
but that's good cause i bagged 75 out of 80 and the pressure is reduced for paper 2!

 

[Skyrior]

i think i lost all my marks on 12Either (or is it 11Either???)
I was stupid to choose either, should have chose or....

 

[omglaigcse]

i think i lost all my marks on 12Either (or is it 11Either???)
I was stupid to choose either, should have chose or....

ugh me too. i did OR halfway and gt stuck, so i did EITHER ): what a waste of marks.

 

[fcbayernmunchen]

and yes! Almost forgot! What was f '' ? I thought it could have been an inverse, solved it right away, and then moved to the next part... *URRRGHHHH* x|

 

[bumblebee]

and yes! Almost forgot! What was f '' ? I thought it could have been an inverse, solved it right away, and then moved to the next part... *URRRGHHHH* x|

well........that wasnt inverse, cuz the next question was inverse and it had a different sign, i think it was second derivative

 

[Ashay]

F'' is also called f double prime which is secon derivative

 

[ThatReallyReallyWeirdDude]

How do you differentiate:
(2 - 5 tan 2x) / 6x
(It's different from the exam one, well, but i want to know how to do that question)

EDIT: Nevermind I'm an idiot. Here's the answer.

There you go. It's from : http://www.numberempire.com/derivatives.php
I checked it myself, it's correct (numerator is 6x2 instead of 36 as 6 was cancelled from denominator)

 

[Spidey21]

Do you mean (2-5tan2y)/6x?
Don't tell me implicit differentiation was in YOUR variant. Cause that'd be hell.

well sorry to break it to you but it was!!
using the quotient rule or whatever that is!!

 

[Spidey21]

Sorry
I meant
Do you mean tanX not tanY?
Because tanY would require some complicated calculus shit which I'm not supposed to know but I know anyway and is not in syllabus.

i dont know if Tan X and Tan Y would make a difference..

 

[ThatReallyReallyWeirdDude]

i dont know if Tan X and Tan Y would make a difference..

There is something called implicit differentiation.
Basic example: Differentiate xy + y^2
normally you'd just get equation in terms of x but in this case you can't so you differentiation straight away. E.g. y^2 = 2dy/dx. :|

 

[Spidey21]

There is something called implicit differentiation.
Basic example: Differentiate xy + y^2
normally you'd just get equation in terms of x but in this case you can't so you differentiation straight away. E.g. y^2 = 2dy/dx. :|

ooooh so you really are ThatReallyReallyWeirdDude
LOL jk
NO OFFENSE!!

 

[kim anika]

varient 1 was hard !!!!!!but it went goodi hope i didnt make ne mistake!!!!!!well BEST OF LUCK EVERYBODY IN SHAH ALLAH WE ALL WILL ACE PAPER 2!!!!!!!