1.

Let pi_(1) be the plane passing through the points (0,1,2), (1,0,-2), (-2, 1,0) and p_(2) be the plane passing through the point (1, 2,3) and perpendicular to the planes x + y + z =1 and 2x-3y + z =5. If theta is the acute angle between the planes pi_(1) and pi_(2) then cos theta=

Answer»

`(sqrt14)/(9)`
`(PI)/(3)`
`(13)/(3 sqrt22)`
`(pi)/(4)`

ANSWER :A


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