MATHEMATICAL FORMULAE 



89 









8 







\\ 



V 





i 1 . \ 



\ 



\ 



TV 



N\ 



8 



<?> ~ 



1 1 



^^ C5 ^D 



CD CD ^} 



V - <O >3 



OIQHO U| D9JV 9DDU!t?JQ UUOJ] MOIJ 



8 



