Value of a1
Value of b1
Value of c1
Value of a2
Value of b2
Value of c2

The vector subtraction is adding the negative of vector b to the vector a.

To calculate vector subtraction you should use the following formula:
subtraction of vectors = (a1 - a2, b1 - b2, c1 - c2)

The vector subtraction is used in order to describe the change in a vector's quantity.

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