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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Alka gupta Best Answer
you solve correct....when we get rt-s^2 =0 then we have to check sign of f(x,y)-f(a,b)....
can you please show me analytically how do we check max or min by the nbd. idea. that you have talked about in your cases.
see....