Probably not (unless Jonathan has cracked this particular nut). Tableau doesn't generally tend to give us access to under-the-cover calcs, variables (Measure Name/Values come to mind) or formulas. But create the trend yourself and it's yours so you have complete access.
I've never known of any way to pull the trend lines out. The are one of the last things to be computed, so that's my guess as to why they aren't available in other calculations.
Thanks guys! I didn't think there was a way but I figured if anyone had figured it out it I would know from posting on the forum.
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Yes, Jonathan is right.
Trend lines are computed after the result table is computed, possibly pivoted for measure names/values and partitioned into Panes. The fields that you can manipulate in Tableau are in the result table. After the result table is visualized, trend lines are drawn on top and reference lines are drawn on top of that. The summary tab in a View Data window shows roughly what is in the result table.