Error in add maths mark scheme oct/nov 2011

[shezi1995]

I think there is an error in the mark scheme. Look at the uploaded image.

 

[asd]

You're right, i guess.

 

[Narcotic]

how did u get 5pie/12??
i mean it is simple .. lemme solve here
y=p+3tan3x
u got p= -2
so=> y=-2+3tan3x
put point (q,1)
1=-2+3tan3x
1+2=3tan3x
3/3=tan3x
3x=tan(inverse) (1)
3x=pie/4
x=pie/12

 

[asd]

where did you get the mark scheme from, It's not on xtremepapers, neither is the paper for oct/nov 11. any other source?

 

[Narcotic]

where did you get the mark scheme from, It's not on xtremepapers, neither is the paper for oct/nov 11. any other source?

there was a link on xtreme papers for papers of oct nov 2011
it is actually from mediafire

 

[asd]

how did u get 5pie/12??
i mean it is simple .. lemme solve here
y=p+3tan3x
u got p= -2
so=> y=-2+3tan3x
put point (q,1)
1=-2+3tan3x
1+2=3tan3x
3/3=tan3x
3x=tan(inverse) (1)
3x=pie/4
x=pie/12

Dude, there will be 2 corresponding values of x for y=1, the one you have found out is for point "A" as he has pointed out in the Pic.
For q, you have to add (1/3) pi. This will get you the x-coordinate for point "B".

 

[asd]

Did you find this error ureself? or you got it frm somebody else...

 

[Narcotic]

Dude, there will be 2 corresponding values of x for y=1, the one you have found out is for point "A" as he has pointed out in the Pic.
For q, you have to add (1/3) pi. This will get you the x-coordinate for point "B".

ok itx nt the required value, bt y ADD pi/3??

 

[asd]

ok itx nt the required value, bt y ADD pi/3??

Look, The period is 120 degrees, which is 2/3 pi, and for point B, the tan curve hasn't completed 120 degrees, its at 60 degrees.
so divide 2/3 pi by 2 and you will have 1/3 pi. To get the x-value for point B add this to 1/12 pi (which corresponds to point A).

 

[asd]

ok itx nt the required value, bt y ADD pi/3??

You do know how I got the period, right?

 

[Narcotic]

Look, The period is 120 degrees, which is 2/3 pi, and for point B, the tan curve hasn't completed 120 degrees, its at 60 degrees.
so divide 2/3 pi by 2 and you will have 1/3 pi. To get the x-value for point B add this to 1/12 pi (which corresponds to point A).

oh sorry!! didn't notice the period...

 

[asd]

oh sorry!! didn't notice the period...

Hope you got it now

 

[ChrisChin]

q=5pi/12, confirmed. The mark scheme is in error.

 

[shezi1995]

Did you find this error ureself? or you got it frm somebody else...

found it myself.

 

[pakiboy]

Hey Do any one of you have notes on relative velocity Its The most difficult chap in add maths!!! at least for me.

 

[Iishrak]

ok this sucks, why shouldn't they recheck what answer they have given to the students? at the end they also have written : cambridge will not enter into any kind of discussion regarding the mark scheme..

i hate english ppl -__- and british education system,