Q 2263212145.     A non-zero vector `vec(a)` is parallel to the line of intersection of

the plane determined by the vectors ` hat(i) -hat(j) ,hat(i) + hat(k)`. The angle between

`vec(a)` and the vector `hat(i)- 2 hat(j) + 2 hat(k)` is `.............................`

A

`pi/4` or `(2pi)/4`

B

`pi/4` or `(3pi)/4`

C

`pi/4` or `(-3pi)/4`

D

`(2pi)/4` or `(3pi)/4`

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