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If hat I + hat j + hat k and hat I + ha...

If `hat I + hat j + hat k` and ` hat I + hat k` are the position vectors of the vertices of a `Delta ABC` taken in order, then `angle A` is equal to

A

`pi/2`

B

`pi/5`

C

`pi/4`

D

`pi/3`

Text Solution

Verified by Experts

The correct Answer is:
D
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