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Derive the equation of a line in 3D pass...

Derive the equation of a line in 3D passing through two points A and B with position vectors `vec(a) " and " vec(b)` respectively both in vector and Cartesian form.

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The correct Answer is:
`(x-x_(1))/(x_(2)-x_(1))=(y-y_(1))/(y_(2)-y_(1))=(z-z_(1))/(z_(2)-z_(1))`
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