Anybody outta here available now to discuss some problems in Paper1 maths A levels?

[Amy Bloom]

I wish to discuss 2 questions on paper 1 maths AS/A level.
Anyone in?
Reply ASAP please. thanks.

 

[Amy Bloom]

So here are the doubts:
http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s09_qp_1.pdf
Questions 4 and 9 only.

 

[anonymous123]

Q4) 'a' is amplitude = 9-3 = 6
'b' is the no. cycles in 2pi = 2
'c' is the y-intercept = 3

ii) we put the values from part i and get y=6sin(2x)+3
set this equal to 0
6sin(2x)+3=0
6sin(2x)=-3
2sin(2x)=-1
sin(2x)=-1/2
let 2x=y
siny=-1/2
y= pi+(pi/6) , 2pi-(pi/6) <== reject this one because we want to find the smallest value
y=7/6pi

2x = 7/6 pi
x=7/12 pi

Q9) i) y=6(3x-2)^-1
dy/dx= -1(6)(3)(3x-2)^-2
= -18/(3x-2)^-2

at x=2, dy/dx = -18/(3(2)-2)^-2 = -1.125

ii) y^2 = (6/(3x-2)^-1)^2
just integrate this and put the limits its easy

 

[Amy Bloom]

anonymous123
Hey thanks.
Can you tell me about the basics to knw for question 4, i mean, in terms of amplitude etc.. for sine cos and tan. Do a briefing kinda of.

 

[anonymous123]

in terms of amplitude? i don't understand your question..

 

[bamteck]

Amy Bloom

So you are ready for Maths P1 on wednesday ?

 

[Anamol shrestha]

help...w10_qp_12 question no. 7 (iii) urgent

 

[Amy Bloom]

in terms of amplitude? i don't understand your question..

Well humm... forget it, when i read your reply carefully i understood. Thanks ^^
Just that can you explain me for cosine and tan, in similar manner. its just this part that i need to refresh my memory.

 

[Amy Bloom]

Amy Bloom

So you are ready for Maths P1 on wednesday ?

Not really... wbu?

 

[anonymous123]

practice here
http://www.wolframalpha.com/widgets/view.jsp?id=feade1d2047977cd0cefdafc40175a99

 

[deepum]

Hey..people..can anyone give all the difficult questions that could ever exist for p1....got my exams tomorrow..

 

[mehdi1028]

solve 2011 may June and Oct /Nov papers ... all three variants

 

[bamteck]

solve 2011 may June and Oct /Nov papers ... all three variants

Why only 2011 ? oO'

 

[bamteck]

Not really... wbu?

Not really
75 % !

 

[mehdi1028]

Why only 2011 ? oO'

I heard that these ones are difficult..

 

[daviruss]

I heard that these ones are difficult..

hmm not tht much but it is good to solve them cuz u knw questions change for every year

 

[daviruss]

So guys wt is the hardest thing u face while solving ?

 

[mehdi1028]

So guys wt is the hardest thing u face while solving ?

Hardest things:
1. Volume of Revolution
2. Domain and Range of Functions.

 

[Amy Bloom]

So guys wt is the hardest thing u face while solving ?

Series questions!

 

[Amy Bloom]

Guys can you explain me why is this so:
-1<sinx<1?
and
Why tan a > sin a when a is 90 degrees?