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Mathematics: Post your doubts here!
Well, with some help from the mark scheme, I can tell that the expression |z-2i| = zz* -2iz + 2iz + 4 Now if you look at it, its pretty similar to the expression already given in the question except that we have a positive 4, instead of -12. -
Mathematics: Post your doubts here!
I've solved this but the working is pretty lengthy. Ill just tell you in short, you gotta break the 1/x^2(2x+1) into partial fractions, and then integrate. youre gonna get -2ln(x) -1/x + 2ln(2x+1)= lny +c Then use (1,1) to find c. Then youre gonna get too many ln's. just put them together in a... -
Mathematics: Post your doubts here!
No because i^2 = -1, so -(bi)^2 = -(-b^2)= +b^2 Neeche brackets me likha bhi hai :p -
Mathematics: Post your doubts here!
|z| = √[(a)^2+(b)^2], and |z|^2 = a^2+b^2 z.z*= (a+ib)(a-ib)= a^2 +aib -aib -(bi)^2 = a^2 + b^2 (N.B i^2 = -1) (z-ki) = a+ib-ki = a +(b-k)i (z-ki)*= a -(b-k)i = a-bi +ki Ooops, HAHAHA never saw you wrote part (ii) :p can't do that one either, I guess Namehere can help you with this :p -
Mathematics: Post your doubts here!
d(1/cosx)/dy= -(-sinx)/cos^2(x)= sinx/cosx.1/cosx =tanx.secx ln(secx + tanx) = (secx.tanx + sec^2(x)) . 1/(secx + tanx) simply, it should give you secx. And for 7, Expand cos(x+45) and then add (-sqrt(2)sinx) to it. then you can express it in that form. -
Mathematics: Post your doubts here!
This is always so confusing. How do you know what theyre asking for when they say the smallest value for |z|? like where does the shortest distance from arg(z-u) to the origin come from? Also, what if they asked for the largest value for |z|? What is z? where do I plot z on the argand diagram... -
Mathematics: Post your doubts here!
Thanks a lot dude! Your method works pretty well in other questions as well Thats unbelievable lol, a D? -
Mathematics: Post your doubts here!
But Why 9p4 and not 9p6? Thanks a lot for your time tho. -
Mathematics: Post your doubts here!
I cant find it on Xtremepapers, but its May/June 2013 P61, Q 6 (ii) -
Mathematics: Post your doubts here!
I wonder if you're equally good in statistics, Permutations and combinations, in particular. Because I posted a question on this same page, can you help me with that? -
Mathematics: Post your doubts here!
you get the correct answer using this? -
Mathematics: Post your doubts here!
What do they actually mean by |z-w|? -
Mathematics: Post your doubts here!
Umm GUYS? Ill post my question again. Four families go to a theme park together. Mr and Mrs Lin take their 2 children. Mr O'Connor take his 2 children. Mr and Mrs Ahmed take their 3 children. Mrs Burton take her son. The 14 people all have to go through a turnstile one a a time to enter the... -
Mathematics: Post your doubts here!
Four families go to a theme park together. Mr and Mrs Lin take their 2 children. Mr O'Connor take his 2 children. Mr and Mrs Ahmed take their 3 children. Mrs Burton take her son. The 14 people all have to go through a turnstile one a a time to enter the theme park. In how many different orders... -
Chemistry: Post your doubts here!
Both compounds are being formed at the same time. And no, D is not being made in place of C. However, in my opinion C is the preferential product of the reaction since production of D has a relatively longer route. And for why D is being made, compound B dissociates in the aq solution giving the... -
Chemistry: Post your doubts here!
Umm did you get your answer yet? well, not in a mood to go through all those 8 pages. Khair, look how theyre changing the concentrations of the reactants, and how the initial rate of the reaction changes. Work them out in fractions; change in conc of reactant A= 1.6/1.1= 1.45 which equals the... -
AS Physics Practical - Paper 34
For justification of sig fig, I always write that to maintain consistency with the readings of "k" and "l" this reading was taken to the same number of significant figures. (here, k and l are 2 readings which we took down earlier and they've asked you to justify the sig fig for M, where M is... -
WHY DO YOU ALL SLEEP SO EARLY? :'( A star daredevil syed1995
WHY DO YOU ALL SLEEP SO EARLY? :'( A star daredevil syed1995- asd
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Physics: Post your doubts here!
Well, I thought that way first, but maybe the surface area wala factor is not as effective as is the weight? :D -
Physics: Post your doubts here!
O_o Now that was totally random O_o Okay, so I guess cause the smaller drop has less weight, so the force required by the air resistance to counter the weight is obv smaller now. It will take less time.