1.

Plane E_(1) is determined by the vectors I and i+j and plane E_(2) is determined by the vectors i-j and i+k. If barais a non-zero vector parallel to the line of intersection of E_(1) and E_(2), then the angle between bara and barb=i-2j+2k is

Answer»

`pi/3`
`pi/4`
`pi/6`
NONE of these

ANSWER :B


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