4ANSWER : D
I WANT METHOD IN SHORT
If point P(1,2,1) lies on the plane 2X-Y+Z=1 considering point Q(0,0,0) ; line segment PQ
is rotated in anticlockwise direction with an angle Î /6 (consider the rotation in the plane
containing line PQ and perpendicular to given plane only), then angle made by new line
segment with the normal to the plane is
(A) 0
(B) cos-1 (2/3)
(C) pi/3 - cos-1 (2/3)
(D) None
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