1.

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)`

Answer» Correct Answer - A
Diagonals are `veca+vecb` and `veca-vecb`


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