timtamboy63 Posted April 15, 2012 Report Share Posted April 15, 2012 IB Smacher asked me this question: Solution: http://imgur.com/a/v8FSs 1 Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted April 15, 2012 Report Share Posted April 15, 2012 My question: Part a) is do-able, but I can't get Part b)? Reply Link to post Share on other sites More sharing options...
Grassroot Posted April 15, 2012 Report Share Posted April 15, 2012 My question: Part a) is do-able, but I can't get Part b)? The first integral, if u solve, gives you arctana-arctan1+c The second integral gives u arctan1-arctana^-1 as they are equal, by moving artana^-1 to the left and arttan1 to the right you have the thing they ask. 2 Reply Link to post Share on other sites More sharing options...
Grassroot Posted April 22, 2012 Report Share Posted April 22, 2012 (edited) http://www.ibsurvival.com/files/file/2311-math-problems-set/These are some of the questions I am not sure of.... (I have no idea how to upload a word document in this forum....)As I am taking further math I integrated 4 options topics.....I really need your help.... skype me if necessary :grassrootzcj Edited April 22, 2012 by Grassroot Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted April 22, 2012 Report Share Posted April 22, 2012 Hey Grassroot, we aren't going to be able to see those images. They point to your computer, which we can't access. To show us the images, you need to upload them to an image uploading site (for example, imgur.com) and paste the link that it gives you here. 1 Reply Link to post Share on other sites More sharing options...
Peanut Butter Jelly Posted April 22, 2012 Report Share Posted April 22, 2012 Can anyone explain how to graph y=2x+cos2x ? without a graphing calculator. This was on the May 2011 P1 exam... Reply Link to post Share on other sites More sharing options...
DeBrogliez Posted April 22, 2012 Report Share Posted April 22, 2012 Can anyone explain how to graph y=2x+cos2x ? without a graphing calculator. This was on the May 2011 P1 exam... I know, this was a difficult question! I think, I'm not sure though, you have to graph y=2x first. And use that line to draw cos(2x) over it. In other words, consider that line to be the equilibrium line (as if the graph paper is rotated a bit) This picture explains more, So its like rotating the graph of cos(2x) to be over the graph of 2x But again, I'm not sure, because the amplitude and the period does not look the same to me! Lets see what others say ... 1 Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted April 22, 2012 Report Share Posted April 22, 2012 Yeah, I think you're right.Vol de Mort, which time zone was the paper? I can;t seem to find that question Reply Link to post Share on other sites More sharing options...
DeBrogliez Posted April 22, 2012 Report Share Posted April 22, 2012 Yeah, I think you're right.Vol de Mort, which time zone was the paper? I can;t seem to find that questionIts from May, 2011, TZ1About a velocity of a particleI have it, but I'm not sure if I can post it here due to copyright! Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted April 22, 2012 Report Share Posted April 22, 2012 Still can't find it, which question is it? Reply Link to post Share on other sites More sharing options...
Peanut Butter Jelly Posted April 22, 2012 Report Share Posted April 22, 2012 last question in section b Reply Link to post Share on other sites More sharing options...
Grassroot Posted April 22, 2012 Report Share Posted April 22, 2012 Here finally uploaded Reply Link to post Share on other sites More sharing options...
itty.bitty.kitty Posted April 27, 2012 Report Share Posted April 27, 2012 how to solve dy/dx+3y/x=8x4 at (1,0) using integrating factor Reply Link to post Share on other sites More sharing options...
The Economist Posted April 27, 2012 Report Share Posted April 27, 2012 how to solve dy/dx+3y/x=8x4 at (1,0) using integrating factor When I use the letter "I" I mean integrating factor. Reply Link to post Share on other sites More sharing options...
LikeA'13OSS Posted April 27, 2012 Report Share Posted April 27, 2012 How do you solve this?Given that (a+i)(2-bi)=7-i find a and b which are real numbers Reply Link to post Share on other sites More sharing options...
Michel Tabari Posted April 27, 2012 Report Share Posted April 27, 2012 Expand the left hand side and compare real and imaginary parts. Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted April 29, 2012 Report Share Posted April 29, 2012 Any idea how to do part b)ii)? Reply Link to post Share on other sites More sharing options...
Grassroot Posted April 30, 2012 Report Share Posted April 30, 2012 think that two friends as one...you will have 2×10×9×8×7and the word any two indicates to pick 2 from 5, we have 2C5=60so it should be 120×10×9×8×7 Reply Link to post Share on other sites More sharing options...
IB Smacher Glau Posted May 1, 2012 Report Share Posted May 1, 2012 P(BIA)=1/3P(BIA')=3/4P(A)=3/5find P(B') and P(AIB) ?any Ided how to tackle this Q the final answer is P(B')=0.5and P(AIB)=2/5 Reply Link to post Share on other sites More sharing options...
dessskris Posted May 1, 2012 Author Report Share Posted May 1, 2012 (edited) Any idea how to do part b)ii)? think that two friends as one... you will have 2×10×9×8×7 and the word any two indicates to pick 2 from 5, we have 2C5=60 so it should be 120×10×9×8×7 but if the two friends were to sit next to Alice, Alice only has 8 choices of seats as she cannot sit on the leftmost/rightmost seats. and there are 6 ppl including Alice. so should be 8*2*1*7*6*5*(5C2)..... answer is 33600 Edited May 1, 2012 by Desy Glau 1 Reply Link to post Share on other sites More sharing options...
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