Mathematics: Post your doubts here!

[CЯeScɘnt]

so much like as physics

i dont know about physics,I've studied it in mechanics

 

[Exo_luhan]

so much like as physics

But in physics we learned dat for displacement we take negative velocity isnt it?

 

[rawaaaan]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w13_qp_12.pdf
in queestion 6 part ii how its max when the answer is +48 it should be minimum???
please reply

 

[rawaaaan]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w13_qp_12.pdf
how to solve question 4 part ii please help
i cant understand the ms or the examiner report

 

[ZaqZainab]

But in physics we learned dat for displacement we take negative velocity isnt it?

in physics its like if upwards motion is positive then downwards will be negative and vise versa

 

[Haya Ahmed]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_13.pdf


Q9
Q7b .. why marking scheme have another answer 11pi/12 and how to get this value Thanks ^_^

 

[Rutzaba]

Question 5 whole question
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_11.pdf

Full working please

simple
a)
you integrate the dy/dx you will get
integral of 3x^0.5 -6
y=2x^1.5 -6x +c
put value of x and y that is given 9 and 2
2=2(9)^.5 -6(9) +c
2=54 -54 +c
c=2
putting values back ul get
y=2x^1.5 -6x +2

b) stationary point means at dy/dx =0
you differentiate the eq of curve that u have just made

2x^1.5 -6x +2=0
u will get
3x^0.5 -6+0=0
x^0.5=6/3
x^0.5= 2
x=4
to check the nature
d²y/dx²= differentiate this
3x^0.5-6
you have 1.5x^-0.5
put value of x-4
1.5(4^-0.5)
you 0.75 >0
thus its minimum....

 

[Rutzaba]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_13.pdf


Q9
Q7b .. why marking scheme have another answer 11pi/12 and how to get this value Thanks ^_^

basicc angle is pi/12
sin is positive in the frst and the second quadrant so
180-angle
in radians thats pi
so pi-pi/12
will give u 11pi/12

 

[Rutzaba]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_12.pdf
in queestion 6 part ii how its max when the answer is +48 it should be minimum???
please reply

its is maximum...
dA/dx= 12- 3x/2
d²A/dx²= -3/2
thats less than 0 so maximum....

 

[Haya Ahmed]

basicc angle is pi/12
sin is positive in the frst and the second quadrant so
180-angle
in radians thats pi
so pi-pi/12
will give u 11pi/12

basic angle is pi/6 not pi/12

 

[Rutzaba]

basic angle is pi/6 not pi/12

no its pi/12
its 2theta not theta

 

[rawaaaan]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w13_qp_12.pdf
in question 10) part i idk how to know its x>3 and x<1.5

 

[Rutzaba]

sin(2Q +pi/3)=1/2
2Q +pi/3 =pi/6
2Q=pi/6
Q=pi/12

 

[Faaiz Haque]

simple
a)
you integrate the dy/dx you will get
integral of 3x^0.5 -6
y=2x^1.5 -6x +c
put value of x and y that is given 9 and 2
2=2(9)^.5 -6(9) +c
2=54 -54 +c
c=2
putting values back ul get
y=2x^1.5 -6x +2

b) stationary point means at dy/dx =0
you differentiate the eq of curve that u have just made

2x^1.5 -6x +2=0
u will get
3x^0.5 -6+0=0
x^0.5=6/3
x^0.5= 2
x=4
to check the nature
d²y/dx²= differentiate this
3x^0.5-6
you have 1.5x^-0.5
put value of x-4
1.5(4^-0.5)
you 0.75 >0
thus its minimum....

I said question 5 ..

 

[Rutzaba]

I said question 5 ..

im to confused these days lol

 

[Haya Ahmed]

sin(2Q +pi/3)=1/2
2Q +pi/3 =pi/6
2Q=pi/6
Q=pi/12

Do you realize that you get -pi/12 ? .. Your answer is NEGATIVE

 

[Faaiz Haque]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_11.pdf

Question 5, 9 full please, thanks!

 

[GCE As and a level]

hey guys
how are u all ?
solve as much as u can, even if only one question !!
i need a help in
1)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w12_qp_12.pdf

Q4 all
Q6 ii)
Q7 ii)
Q8 all
Q10 ii)
Q11 all


2)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s12_qp_12.pdf

Q7 a)

3)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s09_qp_1.pdf

Q2 all
Q10 iii)


4)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_S08_qp_01.pdf

Q5 all
Q6 ii) Domain __ explain it plz


5)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w08_qp_1.pdf

Q5 all
Q6 all
Q9 ii) and iii)
Q10 ii) and iii) and iv)


6)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s07_qp_1.pdf

Q4 all
Q5 all
Q8 ii)
Q10 ii)
Q11 ii)

7)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w07_qp_1.pdf

Q11 v)

8)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w06_qp_1.pdf

Q10 v)


9)
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s12_qp_13.pdf

Q1 all
Q4 all
Q11 iii)

I really need your help
waiting your help
thanks in advance
wish u all good luck

 

[Haya Ahmed]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w13_qp_13.pdf

Q7b please somone explain briefly .. thanks

 

[abruzzi]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_33.pdf
Someone please explain qn 8ii (b) :/

I'm re-posting this. Someone please help me