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ooo i get it now thanks

i thought the rule was lim x>0 sinx/x =1 i cant remember learning that lim x>infinity sinx/x =1 ???

is the answer 8pi/3 u^3?? it was either a really easy question or i got it wrong

woo thats my birthday snow patrol is aweseome ive met gary lightbody =]] their new album will be awesome

if your under 18 you go to bali

haha multiplying santa by i makes him real, i liked that one and the square of a number is like having sex with a girl, if theyre under 13 just do them in your head apart from that, not a big fan

hope your not paying for this goose

i think itll just be p6 as one or more even numbers will make the product even

how can you be doin 4unit volumes already? this time last year i still didnt even know what i was

oi in that jeff geha 50 tips thingy he says the conical pendulum which revolves on a cone or parabaloid is the hardest thing in 4 unit maths does anyone else think that it actually not that hard??

Re: 回复: Re: Help With Volumes it really is aye. volumes and integration would have to be my favourite topics.

yeah you can do it by cylindrical shells, or sometimes just using annulus discs. i prefer the shells method

ok well the theory behind taking volumes is that we take really thin slices (dy) of the revolved curve. by summing those slices we can find the volume if the curve is rotated around the y-axis, to find the volume between the y-axis and the curve, each slice will represent a circle radius of x...

well yes then in two unit you would have to find the volume of the cylinder then subtract the volume when the curve is rotated around the y-axis. but in four unit, you learn a much quicker, funner way

yeah its all just vector addition

no sorry mate your 100% wrong have you ever derive the volume formulas, because if you havent, i doubt very much you understand it.

then its just V= pi S y^4dy from y=0 to y=2

are you finding the volume enclosed by the graph of y=sqrtx and the x axis when its rotated around the y axis between x=o and x=4? because then you would have to do it a different way

ok this is my solution: |4ixy|<4 |i|.|xy|<1 |xy|<1 so the locus is the region between the graphs xy=1 and xy=-1 EDIT: i see now theres been about 4 solutions

wait so its all done on computers? what do the people actually do then??