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Author Topic: [CIE] All Pure Mathematics (P1, P2 and P3) doubts here !  (Read 79986 times)

Offline HUSH1994

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #120 on: March 18, 2011, 01:22:24 pm »
O\N 2009 P11,Q2,how do u the graph :S
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #121 on: March 18, 2011, 01:45:56 pm »
Quote from: ~~!$!HUSH!$!~~ on March 18, 2011, 01:22:24 pm
O\N 2009 P11,Q2,how do u the graph :S

Did the radians part ?

Remember pie=180 degrees, 2pie = 360 and so on, and so 0.5pie = 90.

Take any values (4 or 5) for x (for example x = 1/4 pie, 1/3pie, 1/2 pie and pie) and you will get the values of y, then sketch the graph. Don't forget to see the domain. In this case it is 0 <= x <= pie, so you can not take values in negative and not exceed pie (180 degrees).
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Offline HUSH1994

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #122 on: March 18, 2011, 02:49:04 pm »
thank you fidato,another question is Q7 part i)  why does it have *2x in the end,the coeffient is 1 isnt it?
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Offline Vin

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #123 on: March 18, 2011, 03:46:44 pm »
You've got to take the derivative of (x^2 + 3), therefore 2x.

Revise the formula for differentiation.

[f(x)]n = n[f(x)]n-1 . f '(x)

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Offline HUSH1994

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #124 on: March 19, 2011, 08:18:47 am »
thanks vin,a pain in the @$$ Q is ON 2005 Q5,is where does the r^3 come from and how do u do part 1?
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #125 on: March 19, 2011, 08:37:38 am »
What chapters have you completed in P1 till now ?
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Offline HUSH1994

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #126 on: March 19, 2011, 08:44:05 am »
I finished the whole syllabus and im solving past papers,why?
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #127 on: March 19, 2011, 08:45:24 am »
Quote from: ~~!$!HUSH!$!~~ on March 19, 2011, 08:44:05 am
I finished the whole syllabus and im solving past papers,why?

Good then.
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elemis

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #128 on: March 19, 2011, 08:46:00 am »
Quote from: ~~!$!HUSH!$!~~ on March 19, 2011, 08:44:05 am
I finished the whole syllabus and im solving past papers,why?

I suggest you revise your syllabus.
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #129 on: March 19, 2011, 08:56:37 am »
Quote from: Ari Ben Canaan on March 19, 2011, 08:46:00 am
I suggest you revise your syllabus.

Precise*
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Offline HUSH1994

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #130 on: March 19, 2011, 09:09:54 am »
i will,when i finish my school exams
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #131 on: March 19, 2011, 09:14:41 am »
Quote from: ~~!$!HUSH!$!~~ on March 19, 2011, 09:09:54 am
i will,when i finish my school exams

Maths exams left ?
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Offline HUSH1994

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #132 on: March 19, 2011, 09:19:46 am »
yeah,pure tomorrow and mechanics after tommorow,im perfect at mechanics,i might lose 2-3 marks in hte worst case,but im not good enough in pure,i have a bug problem with graphs,esp trigonometry and some weird volume integration(with diagram) question/
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Offline Vin

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #133 on: March 19, 2011, 02:49:41 pm »
Quote from: ~~!$!HUSH!$!~~ on March 19, 2011, 08:18:47 am
thanks vin,a pain in the @$$ Q is ON 2005 Q5,is where does the r^3 come from and how do u do part 1?

Check those two triangles - red and black.

Use law of similarity and change the subject of formula to h. Then substitute "h" in the formula for volume of a cylinder.
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Offline Vin

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #134 on: March 19, 2011, 02:51:24 pm »
Quote from: ~~!$!HUSH!$!~~ on March 19, 2011, 08:18:47 am
thanks vin,a pain in the @$$ Q is ON 2005 Q5,is where does the r^3 come from and how do u do part 1?

Quote from: Ari Ben Canaan on March 19, 2011, 08:46:00 am
I suggest you revise your syllabus.

If I were you, I'd listen to him^
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