How to calculate distance formula in fx-991MS calculator?

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For formula $X=\sqrt{(A-B)^2 + (C-D)^2}$, how do I store this formula and take the values for A,B,C,D to get the value for X quickly without wasting time to write again the whole thing.

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Using CALC

You may use CALC function, as suggested in this picture extracted from the manual.

Make sure you set the mode to COMP or CMPLX before calculating