Let a,b,c,d in R. For a=< x =< b and c=< y =< d, find(adsbygoogle = window.adsbygoogle || []).push({});

max_{x}{max_{y}{(x-a)(y-c), (x-a)(d-y), (b-x)(y-c), (b-x)(d-y)}}??

it is well known that

max(x,y) = [tex]\frac{x+y+|x-y|}{2}[/tex]

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# Question about max of functions

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