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If vec a = (2,-2,1), vec b = (2,3,6) and...

If `vec a = (2,-2,1)`, `vec b = (2,3,6)` and `vec c = (-1,0,2)`,Find the magnitude and direction of `vec a + vec b - vec c`.

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The correct Answer is:
`gamma = cos^(-1)""(5)/(sqrt(51))`
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