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[" 3.If from an external point "B" of a ...

[" 3.If from an external point "B" of a circle with centre "0" ,two tangents "BC" and "],[BD" are drawn such that "/_DBC=120^(@)," prove that "BC+BD=BO" ,i.e.,"],[BO=2BC" ."]

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If from an external point B of a circle with centre O, two tangents BC and BD are drawn such that angleDBC=120^(@), prove that BC+BD=BO.

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