Vinicius L. Beserra
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 Apr23 awarded Curious Apr22 asked Linear differential equation Apr21 comment What is the tip for this exact differential equation? Sorry. I know that u have made use of change of variable. I understood partially the solution but. For this reason I asked u if some steps where hidden. I can see that u derivate in second line d(y/x). What does LHS and RHS mean?Where´s the original expression? How did u get the 4th line? Apr21 comment What is the tip for this exact differential equation? Sorry. I know that u have made use of change of variable. I understood partially the solution but. For this reason I asked u if some steps where hidden. Thanks Apr20 comment What is the tip for this exact differential equation? Did your hide some steps? Apr20 comment What is the tip for this exact differential equation? Thanks for the helpe, but I need detailed explanation. Apr20 awarded Custodian Apr20 comment What is the tip for this exact differential equation? (x^3+xy^2+y)dx= M and N= (x^2y+y^3−x)dy Apr20 reviewed Approve What is the tip for this exact differential equation? Apr20 asked What is the tip for this exact differential equation? Apr6 comment How do I find a formulae for $S_n$ for the sequence 3/16, 3/64,3/256, 3/1024? The answer is 4^(n)-1/4^(n+1) Apr5 asked How do I find a formulae for $S_n$ for the sequence 3/16, 3/64,3/256, 3/1024? Mar20 comment Help with this differential equation Thanks Frieder. Mar17 comment Help with this differential equation Thanks Frieder. Have you got the book or any site where I can see the solution step by step. It´s because we learn here in other way. In fact your answer is right, but I don´t understand how do you eliminate the natural log in both sides of the equation and how do you find the last line of this expression. \begin{array}{l} (x - 2y + 5){\rm{dx}} = u(1 - 2){\mathop{\rm du}\nolimits} \\ (2x - y + 4){\rm{dy}} = ut(2 - t)du + (2 - t){u^2}dt\\ (1 - {t^2}){\mathop{\rm du}\nolimits} + (2 - t)u{\mathop{\rm dt}\nolimits} = 0 \end{array} Mar16 accepted Help with this differential equation Mar16 asked Help with this differential equation Mar9 comment Solving a differential equation with involving $e$ Thanks Lucian, but in fact I would like someone unmark my question as -1. Mar7 comment Solving a differential equation with involving $e$ As I said before I didn´t misspelled the original funcion. It is as in the book. Mar5 comment Solving a differential equation with involving $e$ No, I didn´t mispelled the equation. In the book it is as I posted here. Mar4 comment Solving a differential equation with involving $e$ y=-x Lg*lg*(C/x)