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[" 18.Show that the point "(x,y)" given ...

[" 18.Show that the point "(x,y)" given by "x=(2at)/(1+t^(2))" and "y=a((1-t^(2))/(1+t^(2)))" lies on a circle for all real values of t such that "],[-1<=t<=1," where a is any given real number."]

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