@FluxWaveZ: Well, take the problem like the wrappers, right? Remember back in those beautiful Alg. 2 days of linear programming? Well, beautiful as in very easy, but nonetheless - calculus can take a meticulous or very constantly repetitive situation and make it simple just through knowledge of rules and using stuff like integrals - something linear programming gave us a very absic idea of. It's just min/max'ing taken to the extent of being able to pinpoint very specific circumstances in a situation; say, drilling for oil given specific man hours and manpower, what would be an optimal usage of resources - I dunno that's bad and more of a linear prog. problem, but it's on the fly and I'm tired.
Also, derivatives and integrals lead to applications in very complex fields - internal thermodynamics, expansion in chemistry, entropy, blah blah blah are all reliant on calculus.
EDIT: it's all dependent on the field too. If you're going to be doing the nitty gritty in building an engine, you don't really need to know high level calculus like this, you're still an "engineer" but you have that analytic mind. Or you're the dweeb designing perfect ratios for the engine to be built with, the parts have a specific composition necessary to run, etc.
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