parametric equations

British  

plural noun

1. a set of equations expressing a number of quantities as explicit functions of the same set of independent variables and equivalent to some direct functional relationship of these quantities

   a circle x²+y²=r² has parametric equations x=r cos θ and y=r sin θ in terms of the parameters r and θ

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Example Sentences

Without missing a beat, the women raised our tired heads from our textbooks, collectively muttered, “Two-hundred and eighty,” and then went back to solving parametric equations.

From Washington Post