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oh, sir, I thought u meant this as a joke.. a really funny one latus latus latus latus latus? laCtus? didn't realise that mazza spelt it wrong

hmm... latus sounds like a flower to me..... laCtus sound like caCtus.... :headbang: :bat: :gridnod: :cool: :argue: :santa: :angry: You have included too many images in your signature or in your previous post. Please go back and correct the problem and then continue again...

hmm.. does this explanation sounds sensible? you get 39*47` ... my corresponding angle is 28 degrees so maybe you wrote 2 as 3 2=3, by inspection :D

expand (cos@+isin@)n (n=2) using De Moivre's theorem. expand (cos@+isin@)n (n=2) using binomial theorem. equate real parts of the two expansions equate imaginary parts of the two expansions tan2@=(2tan@)/(1-tan2@) for this one I think you can do sin2@/cos2@ (write sin2@=2sin@cos@ etc)

it is a kind of fraction :D well some ppl use the word differential form to mean equations like dy=2dx or dy=2xdx, so they can tell which one is which I guess.

0 / (Slide Rule) = 0 rearranging, (Slide Rule) = 0 / 0 So (Slide Rule) is undefined?? What can he be then? :confused:

Oh BTW.. now that I read and think about it more carefully, Q7 isn't necessarily hard.... sometimes they give easy stuff.. probably for the psychological wellbeing of the students haha.... Q7 (a) of 2002 HSC for example. on the other hand Q6 can also be hard sometimes.

Rorix did that without working backwards if he did work backwards, he didn't write it in the final answer (a.k.a. the writing part of the exam booklet) Oh, just realised that, he made it invisible. But it's still there...

that is called: "the technique of adding an extra variable" or the chain rule, if you prefer that word... implicit diff.. I think the idea of implicit diff is apparent in the binomial identity stuff [ remember Rench's thread about (1+x)^n(1+x)^n=(1+x)^2n ] basically it is about...

that means it's a good hint :p

well... didn't I give you a link and a hint? More hint: to become invisible, you can wrap yourself in the code of conduct which can be viewed by clicking the button on the door leading into the Queen Upper Organisation For Terrorism Eradication (I also mentioned this in the Extension 1...

So in other words you're just using V = integral 2pi (Shell radius) ( Shell Height) right? ;) If you do the derivation you should not draw the stretched out rectangular prism as it is irrelevant to the derivation process. In fact it's contradictory to your working because using the full...

Ok, I did it using the cartesian method using g = 9.8, I get @ = 63 degrees or 27 degrees. using g = 10, I get @ = 62 degrees or 28 degrees Now use the 9.8 as model. My quadratics is: 0 = -228.53 cot^2@ +560 cot@ - 228.53 When g=10 just replace the 228.53 with 233.19

I don't think you need to do it manually.. in this computer and robotic era... everything can be done automatically.... Let me also introduce ~MC MATAR~ to the world of invisibility... oh, his or her name is in caps lock too ^_^

hmm.. it doesnt happen on mine.. except... wHEN i iNTENTIONALLY tYPE lIKE tHIS, i see When I Intentionally Type Like This

maybe he was emotional which made me emotional too :p

I think more recently there has been a move towards the practical way: V = integral 2pi (Shell radius) ( Shell Height) EDIT: Can someone call the HSC advice line? Or should I call myself? hmm.....

Ext1 students are NOT expected to write the absolute value sign. Many of them are in fact never told by their teachers about the idea of taking absolute values.

I should really post this two days later, on the 9th of October. But I can't wait... Question 1 (b) Completing the square, x^2-4x+1 = x^2-4x+2^2 - 3 = (x-2)^2 - 3 Int 1/sqrt(x^2-4x+1) dx = Int 1/sqrt((x-2)^2 - 3) dx = ln ( (x-2) + sqrt((x-2)^2 - 3) ) + C using the table of standard...

I completely agree with mojako. He always has the same thought with me. We are true friends !!