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Mathematics: Post your doubts here!
I understand it means "the distance from z to w". -
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Chemistry: Post your doubts here!
There is no winter 2013 examiner report there, just june 2013. -
Mathematics: Post your doubts here!
What year whas that paper from? -
Mathematics: Post your doubts here!
in the question it says: given that cosx = p, find tan(90 − x) in terms of p. -
Mathematics: Post your doubts here!
Got a question, for Q1(iii), why is tan(90-x) the recripocal of tanx? http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_w13_qp_1/ Variant 2. Here i attach the marking scheme: Thank you! -
Mathematics: Post your doubts here!
There isnt any w13_er there... :( -
Mathematics: Post your doubts here!
Btw does anyone know where I can find chemistry winter 2013 examiner report? -
Mathematics: Post your doubts here!
Lets remember you didn´t know how to do the complex number question ^^ -
Mathematics: Post your doubts here!
Well, then you are a future Newton! Im a future Einstein so im not jealous of you :D (just kidding) -
Mathematics: Post your doubts here!
Okay Sir! Did you just believe it when you were told that? Should i simply believe it as well? ^^ -
Chemistry: Post your doubts here!
anyone knows where i can find winter 2013 chemistry examiners report? -
Mathematics: Post your doubts here!
Thank you soo much for your effort and time. However, I still dont full get why it passes through the centre. I mean, is there a rule for when a line passes through the centre of a circle. Could you explain it in mathematical terms please? I mean, "radius makes 90 to tangent and normal makes 90... -
Mathematics: Post your doubts here!
How old are you? Did you teach youself A2 or what? What exams are you sitting this summer? -
Mathematics: Post your doubts here!
I don´t get "it will cut the circle at 90 degree(normal to the point X) the normal to the circumference goes through the centre of the circle." Or are we supposed to know that? How? Why? -
Mathematics: Post your doubts here!
LOL you are on AS and you are doing A2 questions? :D -
Mathematics: Post your doubts here!
Oops, I was supposed to attach this: -
Mathematics: Post your doubts here!
Here I attach my explanation (thanks to hamza.k143 who explained it to me): My only remaining doubt is why or how do we know the line AB intersects at y= -1 (-i), because after that the rest is reasonably easy, its just that assumption I don´t get. So if anyone knows please let me know. -
Chemistry: Post your doubts here!
Q8(a) - For the diagram you are supposed to show that LDPE has a lot of side chains and because of this the straight chains can´t pack together as closely - you can see it as if there were "waisted space", so because of the branching there is more "empty" space between the chains and hence... -
Chemistry difficult past papers questions!
For the 3rd image, is the answer 5 - B? If yes the reason is that for the each side chain there is 3 double bonds, so to saturate it all you would need 3 moles of Hydrogen. In the question it says ONE of its side chains is converted to bablabla (only has 2 double bonds - 1 double bond less...