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The angle between a pair of tangents dra...

The angle between a pair of tangents drawn from a point P to the circle `x^2 +y^2+4x-6y+9sin^2alpha+13cos^2alpha=0` is `2alpha`. The equation of the locus of the point P is

A

`x^2+y^2+4x-6y+4=0`

B

`x^2+y^2+4x-6y-9=0`

C

`x^2+y^2+4x-6y-4=0`

D

`x^2+y^2+4x-6y+9=0`

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