1.

If p = sin (A-B) sin (C-D) q = sin (B-C) sin (A-D) , r = sin (C-A) sin (B- D) then

Answer»

<P>`p + q - r =0`
`p+ q + r=0`
`p - q + r=0`
`p ^(3) + q ^(3) + r ^(3) = 3 PQR`

Answer :B::D


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