title: display formula expression with inputs rather that its result
body: <p>Suppose Cell <code>A1</code> contains the value <code>2</code> and Cell <code>A2</code> contains the value <code>3</code>.</p>
  
  <p>Suppose Cell <code>A3</code> has the formula <code>=A1*A2</code>.</p>
  
  <p>Instead of <code>A3</code> showing the product of the numbers in <code>A1</code> and <code>A2</code>, I'd like it to show "<code>2*3</code>". </p>
  
  <p>So that e.g. if I change the value in <code>A1</code> to <code>7</code>, <code>A3</code> should now show <code>7*3</code>. Can this be done?</p>