Recent content by rdajunior95

I am going to play it soon!

Can you tell me a generalized method to find the centroid when a curve in x-y plane is rotated about the x [b]or[b/] y axis. And one last thing is that how can I use \overline{y}= \frac{\int\int y dydx}{\int \int dydx} and \overline{x}= \frac{\int\int x...

\overline{x}= \frac{\int\int x dydx}{\int \int dydx} In this expression, what do u mean by xdydx. And by 3d I meant when in xy-plane you rotate the curve about x or y-axis to form a 3d shape. like if you rotate a line y=kx, about the x axis, yo will get a cone so how will you find its...

Please help me someone :D

In my Questions I usually have to calculate the Centroid of a curve whose equation is given! I don't know the formula which are used it that, and I have searched on google too and couldn't find anything useful. Can someone provide me with formulas for how to calculate centroid of 2 and 3...

Thanks for the help! :D

I think you have misread. What I have typed is 9231 Further maths! And please tell me from where to start! I haven't even read about it in any books of mine. I have Complete series of Further Maths 1, 2 & 3 for OCR and Further Pure Mathematics by brian gaulter and mark gaulter and complete...

Also I have a question that find a non-singular matrix P and a diagonal matrix D such that (A^5) = PD(P^-1) Where A is a 3x3 matrix A is given but I don't know how to put a matrix in a post! Sorry

they are the people who set out the question paper of 9231 Further maths. So m^2 will be (PD(P^-1))*(PD(P^-1)) so P * P^-1 = I so it will be PDPD. Am I right?

Hi, I get a lot of questions about calculating M^k, where M is a square matrix! They say you can use an equation like M^k=PD(P^-1) where D is a diagonal matrix. I don't know how to calculate this! Any help will be appreciated! P.S. Sorry if this is in the wrong section!

thanks for the links!

I hope this helps! :)

I think you have to use some kind of formula like when a cubic equation has roots (alpha), (beta) and (gamma) than to find the sum of α2 + β2 + γ2 you basically use α2 + β2 + γ2 = (α + β + γ)2 - 2(αβ - βγ - αγ)

Thanks, I will try it out and see if I get the answer :)

The question is :- Find the mean value of (cos 2x)7 with respect to x over the interval 0 ≤ x ≤ 0.25(pi), leaving your answer in terms of (pi). I just don't know the formula for calculating this so if anyone call tell me that hopefully I will be able to solve this question by myself :)