$\text { For } f ( x , y ) = \sin ( 9 x y ) \text {, evaluate } f _ { y } \text { at the point } \left( 2 , \frac { \pi } { 4 } \right)$

question 42

Multiple Choice

$\text { For } f ( x , y ) = \sin ( 9 x y ) \text {, evaluate } f _ { y } \text { at the point } \left( 2 , \frac { \pi } { 4 } \right)$

• A) \(f _ { y } \left( 2 , \frac { \pi } { 4 } \right) = \frac { 9 \pi } { 4 }\)
• B) \(f _ { y } \left( 2 , \frac { \pi } { 4 } \right) = 18\)
• C) \(f _ { y } \left( 2 , \frac { \pi } { 4 } \right) = 9\)
• D) \(f _ { y } \left( 2 , \frac { \pi } { 4 } \right) = \frac { 9 \pi } { 2 }\)
• E) \(f _ { y } \left( 2 , \frac { \pi } { 4 } \right) = 0\)

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