Mathematics: Post your doubts here!

[panda222]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s09_qp_1.pdf
Questions 4 and 9

For Question 4:

a is 6.
b is 2.
c is 3.

Ok so how did i get those values? Using the graph. In any such equation

y = a sin(bx) + c

the a is the amplitude (maximum displacement from rest position)
b is the period (time it takes for one complete oscillation/wave)
c moves the graph up or down on the y axes.

So as you can see from the graph, the maximum displacement is 9-3=6. Therefore amplitude is 6 hence the value of a is 6.

B is how long it takes for the graph to go up, stop, go down, stop then come back up to the equilibirium position. Normally it's 2 pie. But here it's pie. Hence something is doubling the amount of time it takes for a complete wave. Therefore value of b is 2.

C is how up or down the graph is at the y axis. As you can see here, the y interceppt is 3 so c=3.

Question 5:

I did this on a paper and scanned it. Too complicated to explain here.

Part 1

http://i46.tinypic.com/2a8qfle.jpg

Part 2:

http://i46.tinypic.com/rwuxjm.jpg.

Hope i helped. Any more questions just ask. I checked all answers, they are all correct.

 

[Amy Bloom]

Hey thanks panda222.
For graphs of sine cos and tan, can you brief me about the things that you should know about these, i mean in terms of amplitude etc...
One more thing, number 11 of same question paper. How do you do (iii)?
Thanks once again buddy.

 

[parthrocks]

Hey thanks panda222.
For graphs of sine cos and tan, can you brief me about the things that you should know about these, i mean in terms of amplitude etc...
One more thing, number 11 of same question paper. How do you do (iii)?
Thanks once again buddy.

Hey can anyone plzz help me with this:-

can u shoe me each step plzzzzzzzzzzzzzzz or anyone
whitecorp
Amy Bloom
panda222
plzzzzzzzzzzzzzzzzzz
i m unable to upload my file so here is the link
http://www.mediafire.com/?u993euc8iqczo4v

 

[Minato112]

parthrocks : Here are the solutions.

 

[parthrocks]

parthrocks : Here are the solutions.

Hey bro thanks a ton i will never forget you.....one more plzzzz
u r the best.man....i mean its too practical.

 

[Minato112]

Hey bro thanks a ton i will never forget you.....one more plzzzz
u r the best.man....i mean its too practical.

practical? U mean U want the whole working?

 

[parthrocks]

the second part i dont know how to substitute plzz help
http://www.mediafire.com/?uf3ciqc448gj9t5
minato112
whitecorp

hey plzz show me the stps how u substitute i have done this but they say u=cos x so what about the 5sinx^3x in the question what will that be in terms of u....i mean plzz show me the steps my friend.

 

[parthrocks]

practical? U mean U want the whole working?

Bro are you gone crazy.....what else do u expect...i mean according to my understanding level or say a layman(mathematics studnet) can easily grasp ur wonderful steps..its a compelment bro..hha solve the one which i posted now

 

[hussamh10]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_12.pdf Q1 second part..../

 

[Minato112]

the second part i dont know how to substitute plzz help
http://www.mediafire.com/?uf3ciqc448gj9t5
minato112
whitecorp

hey plzz show me the stps how u substitute i have done this but they say u=cos x so what about the 5sinx^3x in the question what will that be in terms of u....i mean plzz show me the steps my friend.

There's a problem with the file. Plz re-upload it.

 

[Minato112]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_12.pdf Q1 second part..../

Is the answer 400?

 

[whitecorp]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_12.pdf Q1 second part..../

Replace y by 2x-x^2, do the necessary expansion and collect all relevant terms involving x^2.

Hope this helps. Peace.

 

[parthrocks]

There's a problem with the file. Plz re-upload it.

http://www.mediafire.com/?uf3ciqc448gj9t5

 

[parthrocks]

Replace y by 2x-x^2, do the necessary expansion and collect all relevant terms involving x^2.

Hope this helps. Peace.

You never help me but why so???
http://www.mediafire.com/?uf3ciqc448gj9t5

 

[hussamh10]

Is the answer 400?

yeah its 400 i got it

 

[hussamh10]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w10_qp_13.pdf Q4 second part plz explain how to make a line i did not get the question

 

[Minato112]

yeah its 400 i got it

U want the workings?

 

[Minato112]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_13.pdf Q4 second part plz explain how to make a line i did not get the question

2 *pie* sin x= *pie* - x

2 sin x = ( *pie* - x) / *pie*
= 1 - (x/*pie*)

Therefore U have to draw the line y = 1 - (x/*pie*) and the number of roots is equal to the number of intersection of the line and ur curve.

Hope it helps

 

[leadingguy]

OHK everyone good luck to those giving p1 9709 on wednesday

 

[bamteck]

OHK everyone good luck to those giving p1 9709 on wednesday

Thank you