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Show that the pair of tangents drawn from (g,f) to the circle x^2+y^2+2gx+2fy+c=0 are at right angles if g^2+f^2+c=0?

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  • Show that the pair of tangents drawn from (g,f) to the circle x^2+y^2+2gx+2fy+c=0 are at right angles if g^2+f^2+c=0?


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