a) rt – s2>0 and r<0
b) rt – s2>0 and r>0
c) rt – s2<0 and r<0
d) rt – s2>0 and r>0
For function f(x,y) to have maximum value at (a,b) is?
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For function f(x,y) to have maximum value at (a,b) is?
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