Author Topic: C3 and C4 DOUBTS HERE!!! (Read 31548 times)

Darkstar3000 · « **Reply #60 on:** January 20, 2011, 06:22:12 pm »

Quote from: astarmathsandphysics on January 20, 2011, 09:13:58 am

cos tan^{-1} infinity =90

Thank you my good sir

qooqo111 · « **Reply #61 on:** January 23, 2011, 02:06:39 pm »

In chp 3 (binomial expansion)
what do they mean by state/find the range of values for which the expansion is valid ....??
Thank You

elemis · « **Reply #62 on:** January 23, 2011, 04:24:44 pm »

Dude ? Seriously ?

There's a thread already in blue on the message board that says ALL C4 DOUBTS HERE !!!!

Why couldnt you post it there ?

Topic merged.

astarmathsandphysics · « **Reply #63 on:** January 23, 2011, 08:01:15 pm »

They mean the series convergences

RoRo · « **Reply #64 on:** February 12, 2011, 02:03:46 pm »

I have a question, which formulas do we need to know for Trigonometry and which ones will be there in the Formula book?

Thanks in advance!

elemis · « **Reply #65 on:** February 12, 2011, 04:01:03 pm »

Quote from: The Secret on February 12, 2011, 02:03:46 pm

I have a question, which formulas do we need to know for Trigonometry and which ones will be there in the Formula book?

Thanks in advance!

Attached is the formula booklet page for C3.

RoRo · « **Reply #66 on:** February 12, 2011, 04:04:14 pm »

Quote from: Ari Ben Canaan on February 12, 2011, 04:01:03 pm

Attached is the formula booklet page for C3.

Thank you so much!!

Sorry to trouble you, but have you got that for C1, C2, C4, M1 and S1? That would be of great help!

elemis · « **Reply #67 on:** February 12, 2011, 04:19:59 pm »

Quote from: The Secret on February 12, 2011, 04:04:14 pm

Thank you so much!!

Sorry to trouble you, but have you got that for C1, C2, C4, M1 and S1? That would be of great help!

http://www.edexcel.com/migrationdocuments/GCE%20New%20GCE/N38210A-GCE-Mathematical-Formulae-Statistical-Tables.pdf

RoRo · « **Reply #68 on:** February 16, 2011, 08:41:21 am »

Quote from: Ari Ben Canaan on February 12, 2011, 04:19:59 pm

http://www.edexcel.com/migrationdocuments/GCE%20New%20GCE/N38210A-GCE-Mathematical-Formulae-Statistical-Tables.pdf

Thanks a lot!

thenewkid™ · « **Reply #69 on:** March 06, 2011, 02:07:32 pm »

jan 2009 c3 edexcel q6

HELP
thnQ

RoRo · « **Reply #70 on:** April 03, 2011, 11:56:29 am »

How do you integrate the following function sec²xtan²x by substitution method? I need the working please, thank you!

elemis · « **Reply #71 on:** April 03, 2011, 02:10:36 pm »

Quote from: The Secret on April 03, 2011, 11:56:29 am

How do you integrate the following function sec²xtan²x by substitution method? I need the working please, thank you!

10 minutes.

elemis · « **Reply #72 on:** April 03, 2011, 02:23:09 pm »

$\int sec^2xtan^2x$

Let u=tanx

$\frac{du}{dx}=sec^2x$

Since du=sec²x dx :

$\int tan^2x~du$

Additionally u=tanx hence :

$\int u^2~du$

Integrating gives :

$\frac{u^3}{3}$

Substituting for u gives :

$\frac{tan^3x}{3}$

RoRo · « **Reply #73 on:** April 03, 2011, 02:58:28 pm »

Quote from: Ari Ben Canaan on April 03, 2011, 02:23:09 pm

$\int sec^2xtan^2x$

Let u=tanx

$\frac{du}{dx}=sec^2x$

Since du=sec²x dx :

$\int tan^2x~du$

Additionally u=tanx hence :

$\int u^2~du$

Integrating gives :

$\frac{u^3}{3}$

Substituting for u gives :

$\frac{tan^3x}{3}$

THANK YOUUU!!

mdwael · « **Reply #74 on:** April 05, 2011, 12:10:03 pm »

Do we have to memorize the expansions of Sin(A+B), Cos(A+B), CosA CosB- SinA Sin B or they'll be given in the formula booklet?
Also does anyone know a helpful website to help me in chapters 6 and 7? (tirgnometry)

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