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I have a couple of questions: 1. Solve cos (x-3) + sin (3-x) = 1 for 2pi ≥ x ≥ 0 2. tan b = (gy) / [a (g + a) + y2] Find db/dy and hence write an expression for y which would maximise b given that g and a are constants. This is where I stuck. 1. So I substitute A = 3 – x, and as cos A...

A person who claimed to be some sort of fortune teller (I read it somewhere few days ago before final matches for each group), said that Mexico will be in the last 8 (means will beat Argentina but lost to Germany) and Germany will face Brazil in final with Germany winning the tournament...

Might as well post my half-yearlies results here since the other topic is nowhere to be seen :p Generally, below my prediction, which is not good; maybe that's because teachers marked the exams harder. ESL My prediction was 50/60 Actual mark is 52/60 (1st/9) Highest mark (exclude me) is...

Yes, if the account is a Commonwealth account; they will not responsible if you sent the money to "other financial institution", like other banks. I have got another question. Is it possible for Commonwealth normal streamline saving account to receive money from another currency, like USD. Is...

How many times in a month you can do these transfers for free? I read somewhere in CommNetBank FAQ that I can only transfer three times to third party account for free each month, after that there will be a small fee. However, I have transfered three times now to different account (and different...

Does anyone know if I can transfer money using Commonwealth NetBank to another bank network like St George Bank or ANZ Bank? If it does possible, is there any fees for doing so? Thanks in advance.

To save BoS bandwidth I guess.

DONE! I have done all my half-yearlies. What a relief! However, I won't be getting the results until next term and I will be worrying over the holiday. :( Here's my thought on the exams: ESL: Quite OK. Did everything, but I think I didn't write long enough for the essay part. Only 3 pages...

I thought we used to have a train service at Bondi Beach... long ago before we used the underground tunnel.

Don't worry, everyone makes mistakes... :) I can't even see how to do it before Riviet showed me the way...:p

Yeah, I just checked it and it is really different...:p Then what is gradient mode for?

But cos(ln16) and sin(ln16) is the same both in degree and radian mode, isn't it? The difference between degree and radian is only in pi.

Hey Riviet, can you finish your working out? What a weird angle... Is it the same for degree and radian mode? While you are there, mind telling me what is gradient mode in calculator for?

Thanks Riviet. But I think there is another alternative method like using conjugate pair or something like that. OK, but your method is simpler and neater anyway. Thanks.:) What is Euler's formula?:confused: And Trev, in your answer, is your x = 0?

Just did my Extension 2 exam today. Question 1 killed me. Let A = 3 + 4i. Write the following in z = x + iy form. a. A square b. 1 over A c. square root of A d. 2 to the power of A Part a and b are done easily. a. Just expand, then collect like terms. b. Just multiply by A's conjugate...

It will usually be at 100kPa and if the question said that the experiment was done in school laboratory, then we can assume that the temperature is 25 degrees Celcius.

Math Extension 2: 21/28 (2nd or 3rd) Should be 23/28 because I have some carry on mistakes and I think I should get some marks. My teacher is trying to sort it out. Still disappointed because the person who come first got 100%...:(

Naturally occuring acids include: stomach acid, lemon and orange juice, vinegar and cheese. Naturally occuring base includes: bicarbonate of soda. Try to search for these substances in order to find their composition and pH. Wikipedia.org is a good place to start.

Do you mean how to write CO2 or CO32-? Type in CO[sub]2[/sub*] and CO[sub]3[/sub*][sup]2-[/sup*] without the stars (*). I think we use = sign for equilibrium and minus greater than signs (->) for forward reaction. I hope that's what you are asking for.:)

The experiment is said to be valid if the conclusion of the experiment leads to one and only conclusion, i.e. the only thing that will affect your result is your independent variable. Therefore, you need to discuss what variables you controlled in your experiment, for example: concentration and...