How to determine f(x) and g(x) for area between curves? So if I'm trying to figure out the area between two curves, I understand that the formula is: ∫ f(x) − g(x)dx But without them telling me which is f(x) and g(x), how do I tell which function is being subtracted and which is being subtracted from? For example I have the equations: x=2y2 and x=4+y2

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