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Looks like he is saying A or B or C is always greater in that interval.
I don't think the point is to prove that one of those is always greater than D, but rather at least one of those will be greater than D for some x and y.
If x,y were in the interval of 0 and 1?
Sorry, maybe ignore that bit, i'm not sure that even makes sense anyway - i was just speculating about how i'd demonstrate that at least one of the values, A, B, C would be greater than D at every value of x and y.
I am not following you here. Please post the exact question. Wording is very important in mathematics.
Hey guys, i'm doing an econ assignment but i'm either going about the question in completely the wrong way - or im stuck on some math that i'm unable to do. Assuming it's the second (because i dont just want to post the question and get you to do the whole thing for me), here's what im stuck on.