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[" E31From a point "P" ,two tangents "],...

[" E31From a point "P" ,two tangents "],[" PA and "PB" are drawn to a circle "],[C(O,r)" .If "OP=2r" ,show that "],[/_APB" is equilateral."],[qquad [CBSE2008," '11,' "12" ] "]

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