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Show that the point (x,y) given y `x = ( 2at)/( 1+t^(2))` and `y = (a( 1-t^(2)))/( 1+t^(2))` lies on a circle..

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The correct Answer is:
`x^(2) + y^(2) = r^(2) ` which is clearly a circle .
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MODERN PUBLICATION-CONIC SECTIONS -EXAMPLE
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