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`vecA - vecB`

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`vecA - vecB = ( x_a - x_b , y_a - y_b )`
`(x_a)"X component of vector A"`
`(y_a)"Y component of vector A"`
`(x_b)"X component of the vector B"`
`(y_b)"Y component of the vector B"`

The vector subtraction (2D) formula, `vecA - vecB` computes the difference of two two-dimensional vectors with x and y components.

Reference

This formula is used in Light and Matter by Benjamin Crowell, Chapter 7.3