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I think you used internal division in the ratio 2:1 instead of 1:2.

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread You are right. I misread two as ten. ._.

Re: Year 12 Mathematics 3 Unit Cambridge Question & Answer Thread I'm having a hard time finding a systematic way of doing parts (c), (d) and (e). Is it necessary to check every number and eliminate the doubles or is there a easier way to do it? Thanks in advance.

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Alright, thanks! ^.^

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread What is the best (HSC) method to do part (d)? Thanks in advance.

That's my thought process as well. Btw it was Q18 from 2015 HSC exam.

What is the explanation for this question given that the answer is A?

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Thank you Integrand!

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Is there a way to do this question without "equating coefficients"? http://pasteboard.co/C1Wjawh.png

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Thank you!

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Not sure on how to work this one out

Re: HSC 2016 3U Marathon \ln\left(\sqrt{x+2}+\sqrt{x-2}\right)-\sqrt{\dfrac{x+2}{x-2}}+\dfrac{x+2}{8-4x}+\dfrac{\ln\left(x-2\right)}{2}

Re: HSC 2016 3U Marathon BY ONLY SUBSTITUTION: (1/2)lnsecarctan(sqrt(x-2)/2)+lnsinarctan(sqrt(x-2)/2)-1/4csc^2arctan(sqrt(x-2)/2)-(1/2)lnsinarctan(sqrt(x-2)/2)+ln(secarctan(sqrt(x-2)/2)+tanarctan(sqrt(x-2)/2))+1/2lntanarctan(sqrt(x-2)/2)-cscarctan(sqrt(x-2)/2)

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I need help in this question. I can see that Tn=n/2^(n-1) but I dont know how to find Sn.

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Unsure on how to do this question :/

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I need help on how to evaluate:

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread For questions 14b and 15d, what is the actual working out? Are you just supposed to tell what they are by trial and error using a calculator?

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Not sure how to go about this one :/