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= pi * int (from 1 to 3) e^2y dy = pi * [e^2y / 2] (from 1 to 3) but how cau u get from e^2y dy to [e^2y / 2] is there have any theorem or what? i learn it by myself.

one more questsion, how can i solve it if it asked to find out the volume of the solid which rotated about the y-axis, from y=1 to y=3, the curve is y=lnx

ahhh, it's easy. thanx anyway

it's not a hard question but i just can't work through it Find the area between the curve y=ln x , the y-axis and the line y=2 and y=4, correct to 3 significant figures.. answer is 47.2 ..

30 Mar start with English, IPT, Maths E2 and Maths E1, biology and chemistry!!!!!!!!!!!!!

THE BEST OF THE BEST Kon

thanx man, u r genius ! ahh so this quz can't solve by normal method , isn't it?

that's what i confused.

i don't know where i'm wrong at this quz? anybody can work out it for me , thanx the curve y=2^x is rotated about the x-axis between x=1 and x=2 use simpson's rule with 3 function values to find an approximation of the volume of the solid formed, correct to 3 significant figures. and the...

that's very very goooood!

yeah, drop that stupid shit

Yeah. i got it . thanks a heap Heinz!

it's sigh of square root

dose anyone can solve this quz for me? i just can't get the rite answer quz Find the exact area enclosed between the curve y=x(x^2-1) the x-axis and the lines x=1 and x=2. thanx anserw is 3 :confused:

thanx . thats alright

thank u sooo much mercury