I am feeling very deflated and thick this morning. I have an engineering degree, but 25yrs and 5 kids later, I cannot remember a damn thing about calculus 
https://twitter.com/InertialObservr/status/1164976471959429121 …
you got this! hint: u-sub! intuitively it's just "integrating from the other side"
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Nope, still completely clueless here! But thanks for the encouragement - you've inspired me to go & relearn all the maths I've lost!
Thanks. Twitter will use this to make your timeline better. UndoUndo
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