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LM741QML: Input Resistance vs Input Differential Resistance

Part Number: LM741QML

When calculating the drop in Vin based on the opamp's input resistances. Do I calculate a drop based on the "input resistance" and then a drop based on the opamp's "differential input resistance", or do I add together the two resistance and then calculated a total drop in Vin? I am thinking two calculations but just want to be sure?