B-

, then

F(x,y) = x² log (x² + y2)

o

what is it value?

lim

and if exist then

# B-

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Answer:(x+1/x)² = 3 x+1/x = √3

(x+1/x)³ = x³ + (1/x)³ + 3(x)(1/x) (x + 1/x) √33x³+1/x³ + 3(√3) +1/x³=3√3-3√3 x³+1 x³+1/x³ = 0