Recent content by AbuYusufEg

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    Graduate Discover the Result of C \nabla as Any Constant in This Comprehensive Guide

    What would be the result of: C \nabla as C is any Constant ? Note: i don't mean: \nabla C as this is known, but i mean: C \nabla
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    Graduate How to find the most far and most close ( points on curve ) to another point ?

    yes i got that, but i want the points that ONLY on the curve C, i think that (x,y,z) is any point. So, How can i get the points that only on the curve C ?
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    Undergrad { changing dxdx to dydx }, When ? and How ?

    i'm still needs help here!, I've exam after about 10 hours ..
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    Graduate How to find the most far and most close ( points on curve ) to another point ?

    how to find the "most far and most close" ( points on curve ) to another point ? i'm studying a chapter on how to find maxima and minima values of a function using partial derivatives. one of the problems is the following: "if plane z=x+y+1 intersects cone z^2=x^2+y^2 let the curve that...
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    Undergrad { changing dxdx to dydx }, When ? and How ?

    Can you write some example please ? as i can't get it from the wikipedia's page !
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    Undergrad { changing dxdx to dydx }, When ? and How ?

    for integration in two variables, say x and y let the original formula have dxdy when can i change it into dydx? and how to do that ? And also: Why ? the only reason for doing that i know till now is for example i have a function that is easy-to-integrate w.r.t. y but not w.r.t x, so i...
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    Capacitors in Common Emitter Amplifier Circuit ?

    Capacitors in "Common Emitter Amplifier" Circuit ? Should i use Capacitors in "Common Emitter Amplifier" ( CEA ) Circuit ? As i saw many CEA circuits designed without any capacitors there ! And also hear that it's better to use two capacitors, one after the Voltage Source ( that feeds the...
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    Graduate What is the mean of that in a find limit question

    i'm sorry but how to use the limits' properties ? i can't get you in your first reply about limits' properties !
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    Graduate What is the mean of that in a find limit question

    is my solution for the following example now is correct ?: ex: For the following function: f(x,y) = \frac{1}{y} sin(xy) ; y \neq 0 And, f(x,y) = x ; y = 0 Find the following: 1- limit when x->0 of ( limit when y->0 of ( f(x,y) ) ) 2- limit when y->0 of ( limit when x->0 of ( f(x,y) ) ) 3- limit...
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    Undergrad How to get the second derivative of this function ?

    it's clear now !, good.
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    Graduate What is the mean of that in a find limit question

    it's clear now, sorry.
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    Graduate What is the mean of that in a find limit question

    So, Can i check it on y=mx and y=x^2 for example, is that enough or also can not be sufficient ? i think you mean -> "If those are the same, then that is the limit" NOT ", then that is not the limit", Right ? i mean, for example: f(x,y) = y/x ; for (x,y) =/= (0,0) Can you check for limit...
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    Undergrad How to get the second derivative of this function ?

    Sorry, But No !
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    Graduate What is the mean of that in a find limit question

    Any Help !
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    Undergrad How to get the second derivative of this function ?

    i'll give a try !, tell me if any thing wrong .. \frac{\partial^2 v}{\partial x^2} = -sin(u).u_x + cos(u).u_{xx} is that correct ? and where is the (u_x)^2 you talk about ? and why should it be here ?