title: How to switch x/y in trendline expression?
body: <p>Without switching axis on chart itself, what is the easy way to switch x and y for the given expression like <code>y = 3E-12x5 - 4E-09x4 + 1E-06x3 + 0.0005x2 - 0.0302x + 23.826</code>. So I would like to get <code>x</code> for the given <code>y</code> series.</p>