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thanks for the links :D will be good to show someone I tutor..

oh and with the counting problems, part of the reason I was getting it wrong was because I forgot to compensate for the 3 T's and 3 N's... so should've divided by 3!3! too

damn, have to differentiate.. never thought of that. not normally requried for domain/range questions! thanks heaps for your help :D

thanks mojako, but for the domain/range questions I was actually after D/R of: x*acos(x) x*asin(x) (I probably should've made it clearer) oh and with the tan one, I wrote the bit in brackets not meaning to times the two, but to write the same thing in a different way to fully show...

Hi, I'm looking for answers to these questions if someone could help out, as I'm a bit rusty and am helping a friend.. (arcsin = sin^-1 doesn't it?) Domain and Range of: xcos^-1x (xarccosx) xsin^-1x (xarcsinx) mainly range I got stuck on. Derivitive of: tan^-1(1/x) + tan^-1x...

I'm doing a commerce degree not an actuarial one And I dropped it down to a minor because I wanted to get some credit for the work I've done, but figured out after doing them that I didn't want to work as an actuary

i started with an actuarial/finance double major, but now have dropped actuarial down to a minor finance is a lot easier than actuarial. and then within finance there's probably about 20 subjects to choose from. just try and avoid henry yip's subjects ;) although fins2624 is compulsory...

By years of practices I can usually just look at it and figure it out. What multiplies to give 'ac' and adds to give 'b' What's this 'psf' method?

Thanks for the quick reply.. :) Yeah, you'd be right about the amplitude, I was just going by memory.. I can see you've basically factorised out the sqrt(a^2 + b^2), but this bit I'm not sure on: How? And so you mean cosx = b/sqrt(a^2 + b^2) too? Actually, just read another...

Thanks. I did a bit of searching around on the net and found some similar info to what you said. I'm fine with my method, but the guy who asked me to explain was taught the cross method, so I thought I might try here to find out an explanation, which I could then pass on. I've since just...

Ok, I've been having a dumb moment for a while... Someone has asked me to explain quadratic factorisation (year 10 stuff), but I never learnt the cross method - always did it another way.. So is anyone able to give me a quick rundown on the cross method?? (used to factorise quadratics when...

need a bit of help with a shm question.. I'm posting it from what I remember when I saw it this arvo (don't have a copy of it with me now) so hopefully I get it right Anyway, the equation was x = asinnt + bcosnt And we were asked to find v and a which was easy Then asked to find period and...