1.

A point O is the centre of a circle circumscribed about a triangle ABC. Then, O vec A sin 2 A + O vec Bsin 2 B + O vec Csin 2 Cis equal to

Answer»

`(O VEC a + O vec B + O vec C ) sin 2 A `
`3 vec(OG), ` where G is the centroid of triangle ABC
`vec 0`
none of these

Answer :C


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