, a) A'"(xy) =- y A^x 
+ [a'"''x+a'^x]. "SfAy 
+ [a'^^x+2Ab.,x+a™x]. '"^A^y 
+ [A"-^x+3A''i-:xf3A" 'XfA'"x], "(TA^'y 
+ + ■+ + 
b) : A"n(xy). = xA™y' 
+ [A"-'y+A'"y]. "-SIax 
+ [A"''''y4-2A'" 'y+A""y],^ "-^A'S 
+ [A'»-V+J^"'-^y+3A"-'y+Z^i-''y]v- "'CA X 
+ + + + 
c) A'Cxy) = [y ^ '»$(Ay "^^A^y ^ -CÅ'y ^ii \ 
■"^TA-y ...]. y 
[ I . "■5(Ay: ^ 2 , V ^ 3 . "'(lA' y #\ 
4. "--^ A^y ^< ...].; A" 'xy 
* [ . - i- ^SA'y; ^-j.-^iJA'y*" 
* [ ■ r. "»AV ti 
4. "j^A^y ^< . . . ].; A^ 
6..'"|)A^y . . . ]. A'-^xJ 
4.*©AV »1* • • . ]. A/'-Sxy 
- ; _ t i.^DA.^y ^ . ..].. A-%. 
Da nu A-"(z)= S-(z), og: -«5f= ^.^^ 
foryaiidles Ligningen G til foigende : 
