In Computer Programming and Mathematics, variables and constants are ways to refering to a value.
For example X=1 and Y=2
The difference being, variables are meant to be arbitary and changable, while constants are meant to be fixed and unchangable.
For example, there is no reason for the value of Pi to change. So the value of Pi would best be represented by a constant.
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Variables change, constants do not.
Constants are fixed numbers that never change, they always stay the same. Variables are number that can change, they 'Vary'.
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variables, coefficents, and constants
It is a more complicated mathematical expression.