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

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

For f(x,y)=sin⁡(9xy), evaluate fy at the point (2,π4)\text { For } f ( x , y ) = \sin ( 9 x y ) \text {, evaluate } f _ { y } \text { at the point } \left( 2 , \frac { \pi } { 4 } \right) For f(x,y)=sin(9xy), evaluate fy​ at the point (2,4π​)

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