Biểu thức 3: "h" left parenthesis, "u" , "v" , right parenthesis equals negative sine left parenthesis, StartFraction, "u" Over 2 , EndFraction , right parenthesis left parenthesis, StartRoot, 2 , EndRoot plus cos left parenthesis, "v" , right parenthesis , right parenthesis plus cosine left parenthesis, StartFraction, "u" Over 2 , EndFraction , right parenthesis sine left parenthesis, "v" , right parenthesis cosine left parenthesis, "v" , right parenthesishu,v=−sinu22+cosv+cosu2sinvcosv
3
Biểu thức 4: left parenthesis, "f" left parenthesis, "u" , "v" , right parenthesis , "g" left parenthesis, "u" , "v" , right parenthesis , "h" left parenthesis, "u" , "v" , right parenthesis , right parenthesisfu,v,gu,v,hu,v
miền u Cực tiểu: negative 2 pi−2π
less than or equal to "u" less than or equal to≤u≤
miền u Cực đại: 2 pi2π
miền v Cực tiểu: negative pi−π
less than or equal to "v" less than or equal to≤v≤