SPECIAL APPLICATIONS OF ANALYSIS 

 Then by (i. 1.363) the 3 values of r are given by the 3 roots of 



= o. 



155 



7.30 Derivatives. 



7.31 First Derivatives. 



0* tan ^ 9 



12. j = sec 2 #. 



rf^c 



^ cot x 2 



I3 ' ^^ = - CSC ^ 



J_sec_^ = sec2 ^ sin ^ 

 d^ 



18. 



rf sec" 1 x d esc 



= 



dx dx 



i 



d sinh x , 



T 9- Tl = cosh x - 



1 cosh x . , 

 20. - - = smh x. 

 dx 



