02 How can I enter or insert a formula?

Enter the coordinate formula for which you want to try unknown variables. For the input of the formulas the same rules apply as for the formula calculator.

In particular, the part about subformulas applies here, since the variable coordinate tool requires an interpretable coordinate format, which in turn is never a correct mathematical expression. I.e. that the formula here without the use of subformulas may fail or lead to unexpected results.