Find the equations to the tangents to th...

Find the equations to the tangents to the circle
`x^(2) + y^(2) + 2gx + 2fy + c = 0 ` which are parallel to the line x + 2y - 6 = 0

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The correct Answer is:

` x + 2y + g + 2f = pm sqrt"" 5 sqrt(g^(2) + f^(2) - c)`

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