Re: Deriviation d/dt(x(t))

*To*: mathgroup at smc.vnet.net*Subject*: [mg27451] Re: Deriviation d/dt(x(t))*From*: dennisw555 at aol.com (DennisW555)*Date*: Sun, 25 Feb 2001 20:55:57 -0500 (EST)*References*: <97a6up$akb@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

>I have a problem, having a definition of a circle: x^2+y^2=r^2 >Where x and y are functions of the time: x(t), y(t) and r ist a constant. > >Now I want to deriviate the equation to get the velocity vector. >It should be : 2 x dx/dt +2 y dy/dt = 0 The velocity vector is simply {dx/dt, dydt}