If you are designing a 3 dimensional coordinate system to define the robots movements then you might use these three letters to define each axis of direction (3 axes perpendicular to each other)
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X has
x and z. Imagine you stuck a pin in the centre of the letters and spun them around. are they the same as they look at the moment?
(x - y)2 - z2 is a difference of two squares (DOTS), those of (x-y) and z. So the factorisation is [(x - y) + z]*[(x - y) - z] = (x - y + z)*(x - y - z)
x, y, z are variablesa, b, c, etc. are constants
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