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Author Topic: [CIE] All Pure Mathematics (P1, P2 and P3) doubts here !  (Read 85137 times)

Offline Arthur Bon Zavi

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[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !
« on: October 31, 2010, 10:13:20 am »
All Pure Mathematics CIE (9709) doubts here!!!

My small Doubt :

Solve the equation  3sin2theta+4cos theta = 4, giving all the roots, in the interval
0 <= theta <= 2\pi
« Last Edit: November 15, 2011, 11:18:41 am by Arthur Bon Zavi »
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #1 on: October 31, 2010, 10:17:15 am »
Post all Pure Mathematics 2 and 3  (9709) doubts here.
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Offline Deadly_king

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #2 on: October 31, 2010, 11:16:34 am »
Quote from: Ancestor on October 31, 2010, 10:13:20 am
All Pure Mathematics CIE (9709) doubts here!!!

My small Doubt :

Solve the equation  3sin2theta+4cos theta = 4, giving all the roots, in the interval
0 <= theta <= 2 pie

Hey man, that's not very difficult. I won't do it but i'll surely give you a hint ;)

Let theta be x

Just replace sin2x by 1 - cos2x

Then let cos x = y and you'll be having a quadratic formula which you solve to obtain the required solution ;D

=> 3y2 - 4y + 1 = 0

I guess that you'll be able to complete the number yourself from now ;)
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #3 on: October 31, 2010, 11:22:48 am »
Quote from: Deadly_king on October 31, 2010, 11:16:34 am
Hey man, that's not very difficult. I won't do it but i'll surely give you a hint ;)

Let theta be x

Just replace sin2x by 1 - cos2x

Then let cos x = y and you'll be having a quadratic formula which you solve to obtain the required solution ;D

=> 3y2 - 4y + 1 = 0

I guess that you'll be able to complete the number yourself from now ;)

I know that was silly. :(
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Offline Deadly_king

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #4 on: October 31, 2010, 11:26:46 am »
Quote from: Ancestor on October 31, 2010, 11:22:48 am
I know that was silly. :(

NO worries buddy, it happens.

You should be glad that you're making mistakes now and not in exams ;)
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Alpha

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #5 on: October 31, 2010, 11:28:06 am »
Oh damn, I mean.  :-[
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #6 on: October 31, 2010, 11:31:55 am »
I am sorry. I have 8 months to go. :(

Thank you Deadly_king and Alpa (It's okay).

+rep to both. :P
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Alpha

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #7 on: October 31, 2010, 11:54:32 am »
I pray you understand my writing. ::)

Most welcome.
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elemis

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #8 on: October 31, 2010, 12:12:54 pm »
Quote from: ~Alpha on October 31, 2010, 11:54:32 am
I pray you understand my writing. ::)

Most welcome.

Your theta's look weird :P
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Alpha

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #9 on: October 31, 2010, 12:14:10 pm »
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elemis

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #10 on: October 31, 2010, 12:31:02 pm »
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Alpha

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #11 on: October 31, 2010, 05:02:03 pm »
Very funny :P
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #12 on: November 06, 2010, 05:11:32 am »
Anybody has got P1 Hugh Neil and Douglas Quadling Book?
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Offline Deadly_king

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #13 on: November 06, 2010, 05:15:17 am »
Quote from: Ancestor on November 06, 2010, 05:11:32 am
Anybody has got P1 Hugh Neil and Douglas Quadling Book?

Yeah I got it. Why?
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Offline Arthur Bon Zavi

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Re: All Pure Mathematics DOUBTS HERE!!!
« Reply #14 on: November 06, 2010, 05:29:09 am »
Quote from: Deadly_king on November 06, 2010, 05:15:17 am
Yeah I got it. Why?

Chapter 10
Exercise 10 D
Q-1 (a) (i) and (ii)

try and tell me!!

Getting the answers, but not being confirmed with which are at the back.. :-\
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