1.

For any four points O(0,0,0),P(1,2,1),Q(2,3,0),R(0,1,-1), the angle between the planes OPQ and PQR is

Answer»

`cos^(-1)((5)/(sqrt(28)))`
`sin^(-1)((5)/(sqrt(28)))`
`cos^(-1)((5)/(sqrt(14)))`
`sin^(-1)((5)/(sqrt(14)))`

ANSWER :A


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