How to select and use multiple formulae in the drop-down of form in PHP

How to select and use multiple formulae in the drop-down of form in PHP

In this tutorial, we will practice the code of using/selecting multiple formulae in the drop down of form as shown below in the figure.

How to select and use multiple formulae in the drop-down of form in PHP
Figure: How to select and use multiple formulae in the drop-down of form in PHP?

 

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