Chen L Posted May 11, 2016 Report Share Posted May 11, 2016 1 hour ago, Haitham Wahid said: Thank you. This question was indeed tricky! but the idea was to realize that sin(a)= sin(π-a). I wish I could have shown you my approach step by step but just writing the formulas and equations would take a tremendous amount of time. I do take physics HL and it went really well It's ok as it has already gone :)) You are the only one I have met so far who said it went well :pp I messed up the last question and got many uncertain answers on P2 so it was not very well for me. Anyway, which uni have you applied to? Reply Link to post Share on other sites More sharing options...
Andrew Posted May 11, 2016 Report Share Posted May 11, 2016 I think I failed this paper. I easily lost the whole 60 points from section B. I am good at maths, but the single two topics I overlooked had to come in section b, complex numbers (SPECIALLY de moivre's theorem and planes), and question 13 could have saved me, since Calculus is my thing, yet I left the question unanswered because I didn't see it (screw me right?). I freaked out so much at qs 11 and 12 that I didn't check the last page. I don't know how that was even possible. I'm looking at some 35/120 :'( Reply Link to post Share on other sites More sharing options...
isaiguana Posted May 11, 2016 Report Share Posted May 11, 2016 I did TZ1 and I think it was slightly harder than the specimen, but still manageable. The strange question, in my opinion, was the final question where it asked to prove a certain expression. Besides that, I think that paper 1 was fine. Reply Link to post Share on other sites More sharing options...
keegansimyh Posted May 12, 2016 Report Share Posted May 12, 2016 I thought section B wasn't too bad at all, the only question I couldn't do (after spending an hour on it) was to find the other solution of that trig equation. I would have left an hour early if it wasn't for that question, which I couldn't solve, even after multiplying through by sinxcosx... Can anyone explain that one? Reply Link to post Share on other sites More sharing options...
Guest iblearner Posted May 12, 2016 Report Share Posted May 12, 2016 For me, I felt like if I had more time, I could have done the exam much better. Reply Link to post Share on other sites More sharing options...
Guest iblearner Posted May 12, 2016 Report Share Posted May 12, 2016 8 minutes ago, keegansimyh said: I thought section B wasn't too bad at all, the only question I couldn't do (after spending an hour on it) was to find the other solution of that trig equation. I would have left an hour early if it wasn't for that question, which I couldn't solve, even after multiplying through by sinxcosx... Can anyone explain that one? just substitute x with pi/12 and i think you'll get the answer. Reply Link to post Share on other sites More sharing options...
keegansimyh Posted May 12, 2016 Report Share Posted May 12, 2016 3 minutes ago, iblearner said: just substitute x with pi/12 and i think you'll get the answer. That's part a, the easy part. I was talking about part b, finding the other solution. Reply Link to post Share on other sites More sharing options...
Guest iblearner Posted May 12, 2016 Report Share Posted May 12, 2016 4 hours ago, isaiguana said: I did TZ1 and I think it was slightly harder than the specimen, but still manageable. The strange question, in my opinion, was the final question where it asked to prove a certain expression. Besides that, I think that paper 1 was fine. There was a specimen paper for math? Reply Link to post Share on other sites More sharing options...
Seung Hun Han Posted May 12, 2016 Report Share Posted May 12, 2016 Section A: One or two hard questions, but was generally OK Section B: First two questions of section B was between OK to Great. Last question, I just gave up on the last part (the conjugate thingy) and just rechecked my calculations in section A and B Reply Link to post Share on other sites More sharing options...
Guest Posted May 12, 2016 Report Share Posted May 12, 2016 (edited) 9 hours ago, Andrew said: I think I failed this paper. I easily lost the whole 60 points from section B. I am good at maths, but the single two topics I overlooked had to come in section b, complex numbers (SPECIALLY de moivre's theorem and planes), and question 13 could have saved me, since Calculus is my thing, yet I left the question unanswered because I didn't see it (screw me right?). I freaked out so much at qs 11 and 12 that I didn't check the last page. I don't know how that was even possible. I'm looking at some 35/120 :'( I know it sucks. In section B I didn't read the second last question properly and I lost like 19 marks for one question. Vector one I lost the 11 marks. ...... but paper 2 I think I can get over 100. It is a shame that our lives are defined by numbers and grades. As long as you did your best, there is nothing to be sad about. I couldn't have done more honestly, but I wasn't being careful enough in the exams. But at the end of the day, the difference between a 6 and a 7 is probably just not being able to solve one or two questions. Exams in general are that superficial.... So don't be sad. Your life is not a number. Edited May 12, 2016 by Guest Reply Link to post Share on other sites More sharing options...
AA21 Posted May 12, 2016 Report Share Posted May 12, 2016 So now that more than 24 hours has passed, how was paper 2 for you guys? Reply Link to post Share on other sites More sharing options...
thecsstudent Posted May 12, 2016 Report Share Posted May 12, 2016 18 hours ago, Lovelife said: I was quite the opposite. I did so poorly in section B......Like so bad bad bad bad bad But paper 2 was fine. Yes paper 2 was a lot better. Hopefully it will make up for paper 1. Reply Link to post Share on other sites More sharing options...
isaiguana Posted May 12, 2016 Report Share Posted May 12, 2016 15 hours ago, iblearner said: There was a specimen paper for math? Yes, your teacher didn't give it to you? Reply Link to post Share on other sites More sharing options...
Guest iblearner Posted May 13, 2016 Report Share Posted May 13, 2016 18 hours ago, isaiguana said: Yes, your teacher didn't give it to you? He said there wasn't any specimen paper for math this year. sigh. Reply Link to post Share on other sites More sharing options...
hpnottv Posted May 14, 2016 Report Share Posted May 14, 2016 in TZ1, did anyone find the question about imaginary numbers and addition and multiplication of roots impossible? (actually impossible, not just really hard. these questions are usually super easy, but i got d^2=-9, which would be imaginary, and it said it had to be real.) i did the problem at least 4 times, and kept getting this answer. Reply Link to post Share on other sites More sharing options...
melissa Posted May 16, 2016 Report Share Posted May 16, 2016 On May 11, 28 Heisei at 4:19 AM, Haitham Wahid said: The second solution is 11π/36. How I found it is by equating the denominators to get (√3+1)cosx+(√3-1)sinx=2√2sin(2x) what do you do do after that? Reply Link to post Share on other sites More sharing options...
Guest SNJERIN Posted May 16, 2016 Report Share Posted May 16, 2016 21 minutes ago, melissa said: what do you do do after that? LHS : (√3+1)cosx+(√3-1)sinx= 2√2sin(x+π/12) 2√2sin(x+π/12)=2√2sin(2x) x+π/12=2x thus x = π/12 also : 2x= π-(x+π/12) 3x=11π/12 Hence x= 11π/36 Reply Link to post Share on other sites More sharing options...
melissa Posted May 16, 2016 Report Share Posted May 16, 2016 15 minutes ago, Haitham Wahid said: LHS : (√3+1)cosx+(√3-1)sinx= 2√2sin(x+π/12) 2√2sin(x+π/12)=2√2sin(2x) x+π/12=2x thus x = π/12 also : 2x= π-(x+π/12) 3x=11π/12 Hence x= 11π/36 isnt it (√3-1)cosx+(√3+1)sinx?? Reply Link to post Share on other sites More sharing options...
Guest SNJERIN Posted May 16, 2016 Report Share Posted May 16, 2016 6 minutes ago, melissa said: isnt it (√3-1)cosx+(√3+1)sinx?? Yeah! Sorry, it should be (√3-1)cosx+(√3+1)sinx, but the logic is still the same. What you need to do from here is two write the LHS in the form of Asin(x+B) where A and B are constants. Reply Link to post Share on other sites More sharing options...
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