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The unit vector normal to the plane x + ...

The unit vector normal to the plane `x + 2y +3z-6 =0` is `(1)/(sqrt(14)) hati + (2)/(sqrt(14))hatj + (3)/(sqrt(14))hatk.`

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What is the interior acute angle of the parallelogram whose sides are represented by the vectors (1)/(sqrt2) hati + (1)/(sqrt2) hatj + hatk and (1)/(sqrt2) hati - (1)/(sqrt2) hatj +hatk ?

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