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Deriviation d/dt(x(t))

• To: mathgroup at smc.vnet.net
• Subject: [mg27407] Deriviation d/dt(x(t))
• From: "Christian Maier" <maier1 at sbox.tu-graz.ac.at>
• Date: Sun, 25 Feb 2001 00:53:30 -0500 (EST)
• 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

Can anyone tell me how to do?
Thans in advance!

Christian Maier