Question: If x 2 + y 2 + dx + ey + f = 0 is the equation of a circle, show that is an equation

If x2 + y2 + dx + ey + f = 0 is the equation of a circle, show thaty + yo xox + yox + dlxtaxo) + e() +5 2

is an equation of the tangent line to the circle at the point (x0, y0).

y + yo xox + yox + dlxtaxo) + e() +5 2 2 + f = 0

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