1.

if O is the point inside the triangle ABC such that /_OBC = A/2, /_OCA = B/2, /_AOB = C/2, then (sin(A - C/2)sin(B - A/2)sin(C - B/2))/(sin""(A)/2 sin""(B)/2 sin""(C)/2) equal :

Answer»

`COS""A/2 cos""B/2 cos""C/2`
`sinA SINB sinC`
1
`COSA cosB cosC.`

Answer :C


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