If `veca` and `vecb` are vectors in space given by `veca=(hati-2hatj)/(sqrt(5))`  `vecb=
Channel: Doubtnut
Date: 17/05/2020

If `veca` and `vecb` are vectors in space given by `veca=(hati-2hatj)/(sqrt(5))`  `vecb=(2hati+hatj+3hatk)/(sqrt(14))` then the value of `(2veca+vecb).[(vecaxxvecb)xx(veca-2vecb)]`, is