Let $f ( x , y ) = \left( x ^ { 3 } + y ^ { 4 } \right) ^ { 5 }$

question 123

Multiple Choice

Let $f ( x , y ) = \left( x ^ { 3 } + y ^ { 4 } \right) ^ { 5 }$ . Find the value of $f _ { x y } - f _ { y x }$ at the point $( 1,2 )$ .

• A) \(- 32\)
• B) \(- 16\)
• C) \(- 8\)
• D) \(- 4\)
• E)0
• F)4
• G)8
• H)16

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