PLATE XXT 



63. Sinysin :^y=.sin xsin:5- X. 



64. Sinysin ^y- sin X sin:^ X. 



n 



l-U- 



4-J- 



4= 



65. Sinysin^^" sin xsiri:^ x. 



66. Sinysinf ^(sinzsinf x-.4-0)=0. 



PuTnIeroon^ Cn^Tid'NewH.yven.Ci 



