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a
00
b
π2 radian
c
π radian
d
3π2 radian
answer is B.
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Detailed Solution
A→−B→ Is in the same plane as A→ andB→ , if A→ and B→ are not parallel. (A→×B→) Is normal to the plane containing A→ andB→ . Hence it is normal to (A→−B→) as well.