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Author Topic: C1 and C2 DOUBTS HERE!!!!!  (Read 97521 times)

Offline astarmathsandphysics

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #615 on: December 24, 2011, 07:17:16 pm »
yes you can relable the axis as 0 to 2pi then graph becomes cos x
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #616 on: December 24, 2011, 07:47:10 pm »
Quote from: astarmathsandphysics on December 24, 2011, 07:17:16 pm
yes you can relable the axis as 0 to 2pi then graph becomes cos x

so you mean that it wouldn't be the right graph ???

you mean it won't be cos 2x
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Offline astarmathsandphysics

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #617 on: December 24, 2011, 08:48:51 pm »
it is the graph of cos 2x
If you relable the x axis so all the x's are doubled, it becomes the graph of cos x
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #618 on: December 24, 2011, 08:54:41 pm »
Quote from: astarmathsandphysics on December 24, 2011, 08:48:51 pm
it is the graph of cos 2x
If you relable the x-axis so all the x's are doubled, it becomes the graph of cos x

ahhaaaaa so I should not change the range right ???
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Offline astarmathsandphysics

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #619 on: December 28, 2011, 10:38:37 pm »
Some trig proofs and quadritic roots worked examples.
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #620 on: December 29, 2011, 07:33:06 am »
Quote from: astarmathsandphysics on December 28, 2011, 10:38:37 pm
Some trig proofs and quadritic roots worked examples.

Thanks alot Sir .....I really appreciate your help  ;)
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #621 on: December 29, 2011, 07:37:22 am »
Quote from: ~ Miss Relina ~ on December 29, 2011, 07:33:06 am
Thanks alot Sir .....I really appreciate your help  ;D ;D ::)

but wait a second......is that for me ???  ::) ::) ::)

I think you posted the answers for questions in that thread.....lol  ;D ;D ;D

 https://studentforums.biz/math-146/quadratics-and-trigonometry-problems!/
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Offline whale95

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #622 on: December 29, 2011, 08:41:09 am »
Note = [2] means to the power of 2

Q) The equation of the curve is y = 3cos2x. The equation of a line is x+2y=? (pi) . On the same Diagram, sketch the curve and the line for 0<x<? .
Find the first 3 terms in the expansion of (2-x)[2] in ascending power of x.
I did the graph but didnt know how to do the line! :S

Q)2cos? = 1/tan?          0<?<2?
I did upto cos?(2sin?-1)=0
so cos?=0  so 0
and 2sin?-1=0 so pi?/6 and pi5?/6
so now I have 3 answers which are in bold! how did pi?/2 and 3pi?/2 come??

Q)sinx=3/5 and angle is obtuse. Find tanx and cosx

Q) sin[2]theta/1-costheta = 1 + costheta  Identities! Sorry if I copied it wrong! next time I will use attachments! to make it easier!

thanks alot i really benefited from the 1st answers! :D
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #623 on: December 29, 2011, 10:32:51 pm »
attached
« Last Edit: December 30, 2011, 07:28:18 am by ~ Miss Relina ~ »
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Offline astarmathsandphysics

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #624 on: December 30, 2011, 11:56:34 am »
whale95 I can't read your question cos of all the question marks.
Please modify your post
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Offline astarmathsandphysics

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #625 on: December 30, 2011, 12:48:10 pm »
that population question attached
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #626 on: December 30, 2011, 01:49:05 pm »
Quote from: astarmathsandphysics on December 30, 2011, 12:48:10 pm
that population question attached
okay Thanks
 

plz if you know (b) part as when I asked on TSR they gave me the answer but it didn't work


also for who have the solution bank you can help me plz by just printscreening the answer and post it
it's Q8 page 116 C2 book
Thanks in advance
« Last Edit: December 30, 2011, 01:55:03 pm by ~ Miss Relina ~ »
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Offline whale95

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #627 on: December 30, 2011, 05:06:52 pm »
Check the attachments please.. Questions!
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Offline astarmathsandphysics

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #628 on: December 30, 2011, 07:31:21 pm »
the series question answered
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Offline ~ Miss Relina ~

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Re: C1 and C2 DOUBTS HERE!!!!!
« Reply #629 on: December 31, 2011, 07:54:08 am »
Quote from: astarmathsandphysics on December 30, 2011, 07:31:21 pm
the series question answered

My life saver
Thanks a bunch  ;D
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