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Angle between diagonals of a prallelogra...

Angle between diagonals of a prallelogramm whose sides are represented by `a=2hati+hatj+hatk and b=hati-hatj-hatk`.

A

`cos^(-1)(1/3)`

B

`cos^(-1)(1/2)`

C

`cos^(-1) (4/9)`

D

`cos^(-1)(5/9)`

Text Solution

Verified by Experts

The correct Answer is:
A
Diagonals are `veca+vecb` and `veca-vecb`
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