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))`

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The correct Answer is:

A

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ARIHANT MATHS-PRODUCT OF VECTORS-Exercise (Questions Asked In Previous 13 Years Exam)

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