Qualification > Math

CIE A Level's Paper 3 Question!

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unknown 101:

--- Quote from: sabbath_92 on May 13, 2010, 05:49:56 pm ---No you don't have practicals in maths.

--- End quote ---

oh crap i thought u were talkin about biology, hahahaha
srry my bad!!!

sabbath_92:

--- Quote from: unknown 101 on May 13, 2010, 05:51:00 pm ---oh crap i thought u were talkin about biology, hahahaha
srry my bad!!!

--- End quote ---


Lol it's aight. I hope I get the answer to the main question though.

unknown 101:

--- Quote from: sabbath_92 on May 13, 2010, 05:53:07 pm ---
Lol it's aight. I hope I get the answer to the main question though.

--- End quote ---

srry i cant help i dont take math :(

ifraha18:
i. x=tan?
 so dx/d?=sec^2?
     dx=sec^2? d?


substitute it for dx in equation...the equation is

1_x^2/(1+x^2)^2 dx
whch becomes
1_tan^2?/(1+tan^2?)^2 sec^2 ?d?
then put in the identity fr 1+tan^2 ? as sec^2 ?

1-(sec^2?_1)/(sec^2?)^2 *sec^2 ? d?
then we get
2_sec^2?/sec^2? *d?
then
(2/sec^2?) _1 * d?
2cos^2? _1 d?
cos2? d?

ifraha18:
queston marks are for thetha

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