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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

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

Christian Maier





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