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Geometrical elucidations and approximation of some functional equations in numerous variables

of the functional equation (1.1). The functional equation (1.1) is related with the reciprocal formula arising in an electric circuit with a couple of parallel resistors. (Ravi et al., 2011) examined the basic stability results of the Reciprocal Difference Functional (RDF) equation and Reciprocal Adjoint Functional (RAF) equation. In recent times, (Ravi and Suresh, 2017) the generalized Hyers-Ulam stability of reciprocal-quadratic functional equation in two variables has been investigated in the form