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Hmm... then I wonder what poster's teacher had got for the answer... lol It would be terrible if he/she has to end up fixing the whole year's results.

No boys are to sit next to each other and so total no.of choices=number without restriction-boys sitting next to each other =8!-6!3!-5!x6x5x3! [6!3! comes from all 3 boys sitting next to one another and 5!x6x5x2! comes from only 2 of the boys sitting next to each other] =8x7x6!-6x6!-5x6x6...

\\cos4x-7sin^22x=0 \\1-9sin^22x=0 \\sin^22x=\frac{1}{9} \\sin2x=\pm \frac{1}{3} \\2x=180^\circ n\pm sin^{-1}\frac{1}{3} \\x=90^\circ n\pm \frac{sin^{-1}\frac{1}{3}}{2}\approx$ 9^\circ44', 80^\circ16', 99^\circ44', 170^\circ16', 189^\circ44', 260^\circ16', 279^\circ44', 350^\circ16' \\$ for...

Since no one answered this question, I'll post the solution although I guess it's been awhile since this was posted. Btw, LaTeX is so hard to use for me.. \\$ Tangent at (sec @, 2^{1/2}tan @) $ to 2x^{2}- y^{2}= 2: \\xsec@-\frac{ytan@}{2^{1/2}}=1 \\$If this is a tangent to...

If you want

Thanks a lot

LOL... You've overestimated my maths skills. I'm sure that there are people in Boredofstudies who are much more talented in mathematics than me.

I got it off the internet and it didn't include the solutions.

hmm... this is actually from CSSA Trial Ext 1 very last Q in 2005... So no one in Boredofstudies can do it?..... Edit: done by Drongoski

Anyone??????????????? (How come my question is being neglected while other maths Q's in this forum are being answered...)

Re: I screwed up my half yearlies I don't know the context (I haven't been reading this thread and cbb to read all), but I presume that you and jm01 are talking about force/torque in a motor? (Tell me if my presumption is wrong) "Firstly, when there there is maximum force there is...

Re: I screwed up my half yearlies But jm01 was talking about MAX FORCE, not MAX TORQUE..

Could anyone post the solution for this question plz? Thanks in advance.

when we say, tan x, we are actually saying tangent x (similarly, sin->sine, cos->cosine) Therefore, "Lines y=mx+2 and y=5x-9 intersect at an acute angle whose tangent is 2/5." -> "Lines y=mx+2 and y=5x-9 intersect at an acute angle theta and tan theta=2/5."

Chem>Phys>Bio>EES>Senior Science

You talked about how cellulose can be used as a raw material for the production of ethanol as a fuel. However, the word "petrochemical" suggests that it isn't enough.....

How is sine rule more accurate than distance formula?

Any correct method should give you the same result. Since your answer wasn't 5, I think it was wrong.

http://www.uac.edu.au/documents/uai/uai-scaling-report-07.pdf

I think what you initially posted is better worded than the corrected version. But I would have said "Is the production of ethanol as a fuel carbon neutral coz then it includes distillation as well as fermentation. Btw, I just realised that I didn't use equations in my answer above lol.. And...