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

>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}

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