Mathematics: Post your doubts here!

[minie23]

was this of any help? il cum to the other Q later perhaps

Thanks. But I think you missed the question. Its June 2006 P3 no. 7(iii)​

 

[Rutzaba]

Please help me with the following questions;
June 2006 P3 no. 6 (i) and no. 7 (i) & (iii)

Ty

 

[littlecloud11]

Please help me with the following questions;
June 2006 P3 no. 6 (i) and no. 7 (i) & (iii)

Ty

7 would be the complex number question, right?
7i)
Once you draw the diagram you can see that A, B, C and O form the vertices of a parallelogram and more specifically a rhombus.

7iii) from part ii you know that u/u* = 3+4i
so argument of u/u* = tan^-1 (4/3)
from your diagram you can see that the argument of u and u* would be twice the argument of u as they are equidistant from the x-axis.
arg of u = tan^-1 (1/2)
so arg u/u*= 2* arg of u
tan^-1(4/3) = 2 tan^-1 (1/2)

 

[minie23]

7 would be the complex number question, right?
7i) View attachment 22246
Once you draw the diagram you can see that A, B, C and O form the vertices of a parallelogram and more specifically a rhombus.

7iii) from part ii you know that u/u* = 3+4i
so argument of u/u* = tan^-1 (4/3)
from your diagram you can see that the argument of u and u* would be twice the argument of u as they are equidistant from the x-axis.
arg of u = tan^-1 (1/2)
so arg u/u*= 2* arg of u
tan^-1(4/3) = 2 tan^-1 (1/2)

Wow, thank you so much ! That really helped indeed

 

[Iffat]

can sum1 plz reply asap!

Hellllllooooo!!! isnt sum1 supposed 2 help me??????!!!!

 

[Rutzaba]

Hellllllooooo!!! isnt sum1 supposed 2 help me??????!!!!

wat do ya need help in?

 

[littlecloud11]

Hellllllooooo!!! isnt sum1 supposed 2 help me??????!!!!

You didn't mention which paper.

 

[Iffat]

wat do ya need help in?

can sum1 plz help with the foll qs
2007 may-jun:
q5
q8q11(i),(ii),(iii)

 

[Iffat]

You didn't mention which paper.

Sry bout dat

can sum1 plz help with the foll qs
2007 may-jun p1:
q5
q8
q11(i),(ii),(iii)

 

[Rutzaba]

p1? or p3?

 

[Iffat]

p1? or p3?

p1

 

[iKhaled]

hey can someone help me with question 10(i) nov/oct 04 paper 3...i need full explanation please

http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_w04_qp_3.pdf

 

[Dug]

∫u^2 e^u du
please solve..... thanks in advance

∫u^2 e^u du
= (u^2)(e^u) - ∫(2u)(e^u) du
= (u^2)(e^u) - I

I = ∫(2u)(e^u) du
= (2u)(e^u) - ∫(2)(e^u) du
= 2ue^u - 2e^u

∫u^2 e^u du = (u^2)(e^u) - 2ue^u +2e^u + c
= e^u(u^2 - 2u + 2) + c

 

[HubbaBubba]

Does anyone know where I could find 'Sigma notation' type questions like the ones in Paper 6- S1? I can't find any online worksheets, that involve finding Σx or Σx^2

 

[Rutzaba]

There are two formulas that you need to consider ​

the first is of arc length represented by 'S' wch is equals to​

S=r@​

where s is the arc length r is th radius and @ is theta. ​

The second is Area of sector = 0.5 (r^2)(@)​

(i)find the length of Ax ​

data=​

r= 12cm​

@= ￗ/6 ​

tan = opp/adj​

tan x= Ax/ 12​

Tan ￗ/6 = Ax/12​

Ax= 12 x root3 / 3​

Ax= 4 root 3 cpouldnt find a suitable application​

 

[Iffat]

can sum1 plz help with the foll qs
2007 may-jun p1:
q8
q11(i),(ii),(iii)

 

[GorgeousEyes]

can any one help me with June 2005 Q7 iii
June 2009 Q10 ii - iii
That's Math As pure .

 

[Rutzaba]

yr tum log yahan diagrams kahan bnate ho? kis application pe... suggest me some good ones. also for symbols like under root and pi and etc

 

[asexamskillme111]

http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_w04_qp_4.pdf

Q6. I don't get why in the marking scheme they only consider Fmax of the box on top. Help please.

 

[Ahmedraza73]

The volume ,V cm^3 of a sphere of a radius r cm,is given by the fromula V=4/3 pie r^3. A pump put air into a second spherical baloon at the rate of 1200 cm^3/s.Calculate the rate in cm/s, at which the radius is increasing at the instant when radius is 5 cm?
I hope someone will solve this