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Let f(x ,y)=x y^2 if xa n dy satisfy x^2...

Let `f(x ,y)=x y^2` if `xa n dy` satisfy `x^2+y^2=9` then the minimum value of `f(x ,y)` is 0 (2) `-3sqrt(3)` `-6sqrt(3)` (4) `-3sqrt(6)`

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