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Determine the signs of the partial derivatives for the function f whose graph is shown below

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Determine the signs of the partial derivatives for the function f whose graph is shown below.

A) fx(?1, 2)
_ positive

_ negative    

B) fy(?1, 2)
_ positive

_ negative    

C) fxx(?1, 2)
_ positive

_ negative    
  
D) fyy(?1, 2)
_ positive

_ negative