12). From the equation \( x^{2}+y^{2}+2 x-2 y-8=0 \) of the circle.
a). Find the centre of the circle
(3 Marks)
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ii). Find the radius of the circle
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\( b\left(\right. \) i). Find the equation of the tangent to the circle \( x^{2}+y^{2}-2 y=0 \) at \( (2,2) \)
(2 Marks)
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