I have a problem that has eaten hours of my time. Each time I work it I get a different answer, which suggests it's an issue with algebra. Since I'm dysgraphic it's highly likely that I'm dropping negatives or making arithmetic errors. (Headbang)
Anyway, I need a step by step solution on this problem. Your solution will go into my notes on this section.
... the ordinary chain rule, straight continuous lines differentiate downwards (integrate up) with respect to x, and the straight dashed line similarly but with respect to the (corresponding) dashed balloon expression which is (one of) the inner function(s) of the composite expression.