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A point O is the centre of a circle circ...

A point `O` is the centre of a circle circumscribed about a triangle`A B Cdot` Then ` vec O Asin2A+ vec O Bsin2B+ vec O Csin2C` is equal to a. `( vec O A""+ vec O B""+ vec O C)sin2A` b. `3 vec O G ,w h e r eG` is the centroid of triangle `A B C` c. ` vec0` d. none of these

A

`(O vec a + O vec B + O vec C ) sin 2 A `

B

`3 vec(OG), ` where G is the centroid of triangle ABC

C

`vec 0`

D

none of these

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The correct Answer is:
C
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