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Find the scalar product of the following...

Find the scalar product of the following pairs of vectors and the angle between them. `veca` = (2,-2,1) and `vecb`(0,2,4)

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`veca = (2, -2, 1)` and `vecb = (0,2,4)`
Then `veca.vecb = 0-4+4= 0`
`implies veca` is perpendicular to `vecb`.
Hence the angle between them is `pi/4`
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