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Angle between diagonals of a parallelogr...

Angle between diagonals of a parallelogram whose side are represented by `veca=2hati+hatj+hatk` and `vecb=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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