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Question

Parametric coordinates of any point of the circle x2+y24x+6y12=0 are?

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Solution

Given equation of the circle is
x2+y24x+6y12=0
x24x+4+y2+6y+9=12+4+9
(x2)2+(y+3)2=52
The parametric coordinates of circle with the form (xa)2+(yb)2=r2 is
(a+rcosθ,b+rsinθ) [θ being the parameter]
The parametric coordinates of the given circle is
(2+5cosθ,3+5sinθ)

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