How would you find the derivative of (5cos(x))/(4-sec(x))?
where are functions of
if you really want to employ the chain rule, you'd have to rewrite the expression as a product and use the product rule. you would need the chain rule to differentiate one of the factors.
... which, in turn, is pretty much the chain rule...
... inside the product rule...
Straight continuous lines differentiate downwards (integrate up) with respect to x, and the straight dashed line similarly but with respect to the dashed balloon expression (the inner function of the composite which is subject to the chain rule).
So, just in case a picture helps...
Don't integrate - balloontegrate!
Balloon Calculus; standard integrals, derivatives and methods
Balloon Calculus Drawing with LaTeX and Asymptote!