1.

A non-zero vector a is parallel to the line of intersection of the plane determined by the vectors hat(i),hat(i)+hat(j) and the plane determined by vectors hat(i),-hat(j),hat(i)+hat(k). The angle between a and (hat(i)-2hat(j)+2hat(k)) is

Answer»

A`(PI)/(6)`
B`(pi)/(4)`
C`(pi)/(3)`
D`(2pi)/(5)`

Answer :D


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