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Find the area of the parallelogram whose...

Find the area of the parallelogram whose adjacent sides are determined by the vectors `vec(a) = hat(i) - hat(j) + 3hat(k)` and `vec(b) = 2hat(i) - 7hat(j) + hat(k)`.

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Find the projection of vector hat(i) + 3hat(j) + 7hat(k) on the vector 2hat(i)-3hat(j) + 6hat(k) .

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