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The answer in the textbook is [squrt of(x^2 +1 )]/x.

Thanks but can you find any other way? because after substituting x=tanA and simpifiying, I have to substitute again sinA=u which makes the final anwer look... not really nice O_O. I got 1/ sin (tan^-1 x) Correct me if I'm wrong

Hi everyone, how would you do this question?? Find the integral S dx/ [x^2 . squrt of (x^2 +1 )] My apologies I don't know how to use codes

eehh, THanks. Im done = =

THanks guys for all your replies. @EvoRevolution: I've tried your way but it's getting quite complicated because the mid-point involves "m" (which I don't know how to get rid of afterward) while the intersection of the normals does not involve "m". maybe i'm wrong = =! @gurmies: I'm not sure...

wow thanks for your immediate response. btw what do you have for the point of intersection of the normals?

It's question 20 page 89 in Fitzpatrick. I have attempted a few ways in approaching it but still I am stuck - -'. If you have some time please take a look and help me. Any idea will be really appreciated. this is the question: P and Q are points on the ellipse (E) and the chord PQ contains a...

eg CO2, SO2 I"m confused with this because in my note, SO2 and CO2 are used as counter-examples of Davy's definition of acids.

Thanks Ashabella. My problem doesn't really invovle with depression due to the HSC though. It's just that I can't befriend with anyone. In the past I've tried to sit with many different groups, only to find out that I'm so different from my friends in some ways. I can neither bear the way they...

I don't have any friend. I dont' feel like I can trust anyone, even the teachers. I'm so lonely, but I think I can survive though...

suppose you can voice 2 words in one second, then in forty minute: 2x60x40=...

You sound like some of my teachers.

Me too; that's why I always talk to myself when I do Math extention2 and drink coffee sometimes when I do Physics.

the bad news is I can't really concentrate on anything else since I"m always occupied by this "Special relativity".

LOL. I don't know what I should compare it to... The funny thing is I used to understand it, like when we came to this topic in class I also did heaps of research and I think I did find out something which made me got the concept. Then 3 weeks after the holidays had started, yea I posted this...

Well maybe I should stop thinking about it for a while O_o

yea you're right. It was what i found in some other sources as well, but it is not mentioned in the textbook as the reason why the speed of light is assumed "constant" .

Thanks pwnage for your help so far. I've had a quick look at the note you suggested; its explanation is just excellent and I'll read in details when I could find a more quiet place. The thing is at first I do understand the concept. It's the way the thought experiment written in my textbook...

but wait, is it true that in the laws of electromagnetism described by James Clerk Maxwell in 1860's the speed of light emerges from the equation as a constant and independent of the velocity of the observer? Is it also possible that this is the reason why the speed of light can't be more than c...

Well, if he didn't want the Principle of Relativity to be violated, he could have assumed that both the passenger sitting on the train and the observer on the embankment perceive light as having the same constant speed c [so that even if we set up experiments to measure the speed of light on a...