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GAOKAO · Conic Sections · Advanced

Conic Sections: Pair of tangents from math to math: length of tangent?

Ellipse, hyperbola, parabola standard forms.

Try the problem

Pair of tangents from (5,0)(5,0) to x2+y2=9x^2+y^2=9: length of tangent?

Hint and answer

Concept to use

Intersection of conics.

Hint

S1\sqrt{S_1}.

Answer

4

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