Mathematics: Post your doubts here!

[Komail Sabba']

h=90 m k=1/15Pi

So h=60(1-coskt)

60-60cos1/15Pit=90

-60cos1/15Pit=30

cos1/15Pit=-1/2

1/15Pit=2/3Pi or 4/3Pi

so t= 10 and t=20

isn't it 5/3 Pi ?
and t=25?

i got 10<t<25

 

[kitkat <3 :P]

Wait what we had to find a range oh no I just got 10

 

[Komail Sabba']

Wait what we had to find a range oh no I just got 10

they said "the time for which the passenger was at a height greater than 90" not "the time at which the height was 90"

 

[kitkat <3 :P]

they said "the time for which the passenger was at a height greater than 90" not "the time at which the height was 90"

I misread it

 

[Georgtchernev45]

Nope its not because cos =0.5 The angle equals to 60 degrees when its -0.5 you get 120 so you do the negative quadrants which are 120 degrees which is 2/3Pi and 240 degrees which is 4/3Pi

 

[Georgtchernev45]

Btw guys listen i did find the values t=10 and t=20 like i didn't cross out t=20 so will they give me a mark?Like i kind of circled t=10 to distinguish it

 

[Komail Sabba']

Nope its not because cos =0.5 The angle equals to 60 degrees when its -0.5 you get 120 so you do the negative quadrants which are 120 degrees which is 2/3Pi and 240 degrees which is 4/3Pi

oh right.. what a stupid mark to lose hahaha :0

 

[Georgtchernev45]

its okay man i think that part of the question was actually out of 2 marks LOL but proving that k=1/15Pi was actually out 3 marks as far as i remember

 

[Bilal Khan]

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

Yes.

 

[sara kamal]

Well I believe questions were all tricky and paper was lengthy , no question was asked straightforward... any idea about threshold?? I'm losing almost 15 marks so wot could be the grade in this paper??

 

[sara kamal]

http://maxpapers.com/wp-content/uploads/2012/11/9709_s12_qp_42.pdf
Q5 part 2
please explain how can we do such questions ??

 

[Zash Riyash]

Greetings everyone, is it true that the mathematics paper had leaked? If it did won't it mess severely with the threshold? Or is gonna be a situation where everyone is forced to give the paper again, a different paper?

 

[Aina]

Also someone explain Q10 part (iv) please? Same paper
http://maxpapers.com/wp-content/uploads/2012/11/9709_w08_qp_3.pdf
Very weird question :/

 

[Aina]

Plz some one help me out with topic permutations and combinations......

 

[Ram97]

Plz some one help me out with topic permutations and combinations......

Sure!

 

[ashcull14]

had maths p1 paper been leaked in lahore...if thats so what will happen ??????

 

[Aina]

Sure!

????

 

[Ram97]

U need help in P&C so I might be able to help u

 

[TheJDOG]

Hey thanks, I get the working but I want an explanation :/ how do we know that the vertices of the equilateral triangle on the circle on the Argand diagram are the complex numbers z, zw and z/w ? How do we know this?

 

[Aina]

"Within 1 standard Deviation of mean" mtlb :/