Mathematics: Post your doubts here!

[Debonny1]

Can someone please do part 1. Thanks

 

[Debonny1]

This a long but easy question .

Do we integrate the equation :S should we open the brackets first?

 

[Aina]

View attachment 53147

 

[TheJDOG]

View attachment 53151 Can someone please do part 1. Thanks

Q6) I)First off, were told that perimeter of shade= 1/2 circle circumference
Find radius of shade by dropping down a perpendicular so you get this in terms of r and x. Also theta here will be 2x. Radius of shade we do cosx= Adj/r , hence adj = rcosx and so side AB= 2rcosx
Also side AC is 2rcosx
So Perimeter Shade= 1/2 Circle Circumference Get arc length = rtheta = 2rcosx 2x= 4rxcosx
Arc + AB + AC= 1/2 x 2pier
4rxcosx + 2rcosx + 2rcosx= pier
Cross r
4xcosx + 4cosx = pie Notice on left hand side cosx is a common factor

So cosx(4x + 4) = pie
Cosx= pie/(4x + 4)
X = cosinverse(pie/4x+4)

 

[TheJDOG]

Thanks , but it didn't need that much working , it only carries one mark .
I got it by 1100 x 10 x ( 160/1760)x directly.

True

 

[Aina]

Q6) I)First off, were told that perimeter of shade= 1/2 circle circumference
Find radius of shade by dropping down a perpendicular so you get this in terms of r and x. Also theta here will be 2x. Radius of shade we do cosx= Adj/r , hence adj = rcosx and so side AB= 2rcosx
Also side AC is 2rcosx
So Perimeter Shade= 1/2 Circle Circumference Get arc length = rtheta = 2rcosx 2x= 4rxcosx
Arc + AB + AC= 1/2 x 2pier
4rxcosx + 2rcosx + 2rcosx= pier
Cross r
4xcosx + 4cosx = pie Notice on left hand side cosx is a common factor

So cosx(4x + 4) = pie
Cosx= pie/(4x + 4)
X = cosinverse(pie/4x+4)

I took AB as rcosx..... plz explain

 

[DeadlYxDemon]

32/3 pi. The Ans for the Volume Q

 

[Komail Sabba']

how was p1? (don't discuss)

 

[nehaoscar]

how was p1? (don't discuss)

Horrible :/

 

[nehaoscar]

how was p1? (don't discuss)

How was it for you? and which variant?

 

[kitkat <3 :P]

Ch 2 - http://www.examsolutions.net/maths-revision/syllabuses/CIE/period-1/P1/module.php
It'll be very easy once u see all of these videos of Ch - 2 Functions.
All the best Asmu ^_^

Thanks :/ pata nai kesa hua

 

[Heyyy]

how was p1? (don't discuss)

Very easy.

 

[Sarah Ch]

I GAVE VARIANT 12 MATHS ALEVELS?
HOW WAS IT GUYS?
I WANT TO DISCUSS.

 

[farhan141]

I GAVE VARIANT 12 MATHS ALEVELS?
HOW WAS IT GUYS?
I WANT TO DISCUSS.

U cant discuss before 24 hours. U can Message me if u want to discuss.

 

[Sarah Ch]

where can I message?

 

[The Sarcastic Retard]

where can I message?

Inbox!

 

[DeadlYxDemon]

32/3 pi. The Ans for the Volume Q

^ Integration Question

 

[Heyyy]

32/3 pi. The Ans for the Volume Q

16/3 pi

 

[DeadlYxDemon]

16/3 pi

Seriously? Well I got the ans in -ve and since Vol can't be -ve I wrote it as positive and plus every class has a genius guy so he too got the same ans.

P.S. He's my friend

 

[farhan141]

Lol rip.