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What is the value of a so that 6hati+2ha...

What is the value of a so that `6hati+2hatj-3hatk` and `hati-4hatj+ahatk`are orthogonal to each other ?

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What is the value of x so that the vector 6hati+2hatj-3hatk and hati-4hatj+xhatk are perpendicular to each other.

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