Find all the saddle points of the function. $f ( x , y ) = x \sin \frac { y } { 2 }$
A) $( 3 \pi n , 0 )$
B) $\left( 0 , \frac { \pi n } { 2 } \right)$
C) $( 2 \pi n , 1 )$
D) $$( 0,2 \pi n )$$
E) $\left( \frac { 2 n } { \pi } , 0 \right)$

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The Answer of Find all the saddle points of the function. $f ( x , y ) = x \sin \frac { y } { 2 }$
A) $( 3 \pi n , 0 )$
B) $\left( 0 , \frac { \pi n } { 2 } \right)$
C) $( 2 \pi n , 1 )$
D) $$( 0,2 \pi n )$$
E) $\left( \frac { 2 n } { \pi } , 0 \right)$

Find All the Saddle Points of the Function f(x,y)=xsin⁡y2f ( x , y ) = x \sin \frac { y } { 2 }f(x,y)=xsin2y​

Find All the Saddle Points of the Function $f ( x , y ) = x \sin \frac { y } { 2 }$