Give an Appropriate Answer $$f ( x , y ) = \ln \left( \frac { y ^ { 10 } } { x ^ { 9 } } \right)$$

question 20

Multiple Choice

Give an appropriate answer.
- $$f ( x , y ) = \ln \left( \frac { y ^ { 10 } } { x ^ { 9 } } \right)$$

• A) \(\frac { \partial f } { \partial x } = - \ln \left( \frac { 9 y ^ { 10 } } { x ^ { 10 } } \right) ; \frac { \partial f } { \partial y } = \ln \left( \frac { 10 y ^ { 9 } } { x ^ { 9 } } \right)\)
• B) \(\frac { \partial f } { \partial x } = \frac { 10 } { y } ; \frac { \partial f } { \partial y } = \frac { 9 } { x }\)
• C) \(\frac { \partial f } { \partial x } = - \frac { 9 } { x } ; \frac { \partial f } { \partial y } = \frac { 10 } { y }\)
• D) \(\frac { \partial f } { \partial x } = - \ln \left( \frac { 9 } { x } \right) ; \frac { \partial f } { \partial y } = \ln \left( \frac { 10 } { y } \right)\)

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