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Re: When are your trials? Are you ready? (merged) Good luck! My trials begin on monday.. and im still up doing an assessment for english, which is due today lol. I'm not ready at all. I haven't started studying! 5 days left :S

no worries :) is the answer correct though?

because i was simplifying it.. multiplying the reciprocal.. for example (1/5) divide by 7 = (1/5) x (1/7) = 1/35 but in this case f'(x)=((-2x/x^2).ln3) divide by (ln3)^2 =(-2x.ln3/x^2) x (1/(ln3)^2) = -2x/(x^2).ln3 is that better? :S

using quotient rule.. f'(x)= (u'v-v'u)/v^2 let u = -lnx^2 u' = -2x/x^2 let v=ln3 v'=0 therefore f'(x)=-(2x/x^2).ln3/(ln3)^2 =(-2x.ln3/x^2) x (1/(ln3)^2) = -2x/(x^2).ln3 sorry that's the best i can explain it.. it might be best if you write it out. hope that helps.

f(x) = log3(1/x^2) = log31-log3x^2 = 0 - log3x^2 = -lnx^2/ln3 using quotient rule.. f'(x)=-(2x/x^2).ln3/(ln3)^2 =(-2x.ln3/x^2) x (1/(ln3)^2) = -2x/x^2.ln3 i think.. lol.

Oh okay.. I just thought dt indicated that I was integrating with respect to t.

Yeah I was thinking that as well.. but it just seemed like the most logical way to go about it :S

I did this.. but I'm not sure :S it could be wrong ∫1/20t-5t^2 dt = 1/20-10t x ∫(20-10t)/20t-5t^2 dt =1/20-10t x ln (20t-5t^2) =ln(20t-5t^2)/(20-10t ) + c

That was really helpful. Thanks.

oh i see. thanks heaps for that :)

Hi, can someone please help me find the derivative of: y=sin(sin inverse x) I did: dy/dx = 1/sq rt.(1-x^2) cos (sin inverse x) Apparently the answer is 1 according to the textbook. Thanks!

I'm considering it. There's so much work involved.. yet I still haven't started arghh! :worried::( Anyone else currently on 0 word count? LOL.

I'm pretty happy with mine.. despite having economics and food tech (lol) on the same day. Fri 19 Oct - English Paper 1 Mon 22 Oct - English Paper 2 Mon 29 Oct - Mathematics Wed 31 Oct - Maths Ext. 1 Fri 2 Nov - English Ext. 1 Tues 6 Nov - Economics, Food Tech Thurs 8 Nov - Legal Studies...

I haven't even started my draft. I'm honestly driving myself crazy with all this procrastination.. < 4 months to go. :bomb: