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Given veca=hati+2hatj+hatk, vecb=-hati+2...

Given `veca=hati+2hatj+hatk, vecb=-hati+2hatj+hatk and vecc=3hati+hatj`. Find a unity vector in the directionof resultant of these vectors. Also find a vector `vecr` which is normal to both `veca and vecb`.

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