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

question 31

Multiple Choice

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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