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the modulus of the complex number we want = sqrt(25^2-15^2)=20 the argument is 53.13 degress therefore the answer is 20cis(53.13degrees), better change the degree into minute and second...

Use 15/25 = sin(alpha) then alpha can be evaluated, which is....36.86989765 degrees, better change it into minute and second then the least positive argument is 90-36.86989765=53.13010235degrees

can anybody help me to reduce the size of the graph? it is way too big!!!800kb, while it allows only 100kb i used paint

?? u dont understand my solutions? tell me, which one i dont mean to tutor u, i have got enough students:(

but answering this way in an exam, with the need of explaining the above thing, is risky for wohazz my method is the traditional one and actually does not require the brain...i think it is more practical, considering the tension during the exam.... but anyway, who does not prefer an fast...

go through the syllabus dot points and make sure u fully understand what each d.p involves. I recommend that u can try writing a summary/response for each d.p. Just like what hipsta jess has said, for the dot point:haber process, u should consider various information such as the history(if...

the chem exam is really closely related to the syllabus, for examples, the long essay questions appeared in the past hsc exams are actually derived from the syllabus dot points, with small variations on the wordings chem is not hard if you like it and make it an interesting subject. Chemistry...

o the maths god, turtle

no worry, that 's an alternative solution the most important thing now is that u know how to approach it:) :)

i am not recruiting any...i am not making the tutoring business big..lol child abuse form?:confused: :p

lol

i was just shocked by the class average if the test was that hard, well, don't worry, it may be scaled up eventually:)

i am willing to help too ^_^

thanks:) a lot :D

no , freaking _out it is actually quite(or totally!!!) different from 4u maths we learnt but i have seen some hsc general maths stuff and i reckon it is alright it is just that the maths being studied are different :) :) :) :) :)

i know..i probably wouldn't:( but no worry:) i will try

btw can anyone kindly tell me how do u people compress the image size so much? so much to the extent that can be allowed for upload...thanks^_^ because the avatar size is 100*100 pixels only and i found that cro_angel and minai all put their photoes in their avatars....the size of photo is...

you will be alright^_^

50%? u mean 50/100? that should be concerned