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In geometry, two vectors can be said to be coincident when they point in the same direction, regardless of their magnitudes. In other words, they lie upon each other. If two coincident vectors are both normalized (shortened or lengthened to be one unit long), the resulting vectors would be identical. The dot product of two coincident vectors is the product of their magnitudes. The cross product of two coincident vectors is a vector of all zeros.

Source: Wikipedia.

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